EFEST SLIM K2 DUAL BATTERY CHARGER
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PRODUCT DESCRIPTION
Efest Slim K2 Charger – Portable Dual-Slot Battery Charger for 18650, 20700 & 21700 Batteries
The Efest Slim K2 Charger is a compact, high-quality battery charger designed for vapers and device users who need fast, reliable charging on the go. Engineered with a dual-slot design, this charger independently monitors each battery to deliver a safe and consistent charge every time. With Micro USB input, 1A charging, and a lightweight build, it’s an ideal choice for anyone looking for a portable lithium battery charger for vaping devices, flashlights, and tools.
Each charging slot features an LED indicator to clearly show charging status and when your batteries are fully charged. The Slim K2 integrates multiple safety protections—including reverse polarity protection, short-circuit protection, and overcharge protection—to ensure your batteries stay safe throughout the charging process.
Compatible with a wide range of 3.6V/3.7V lithium batteries, the Efest Slim K2 Charger works seamlessly with popular sizes such as 18650, 20700, and 21700 batteries, making it a versatile option for electronic cigarettes, flashlights, and compact electronic devices.
| Feature / Specification | Detail |
| Compatible With | 10440, 14500, 14650, 16340, 16650, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 26500, 26650 |
| Design | Portable Design with Quality Piano Strings |
| Indicators | Battery Life LED Indicator Light |
| Charger Type | Dual Slot 5V/1A Micro USB Charger |
| AC Input Power | AC 100~240V 50/60Hz |
| DC Output Power | DC 5V 1A |
| DC Input Power | DC 5V 1A |
| 1A CC Current | 1000mA (+/-10%) |
| Auto Cut-Off Voltage | 4.20 (+/-0.05V) |
| CV Cut-Off Current | <100mA |
| Standby Current | <20mA |
| Activation Current | 50mA~100mA |
| Auto Recharge Voltage | 4.10 (+/-0.10V) |
| Operation Temperature | 0°C ~ 40°C |
| Storage Temperature | -40°C ~ 70°C |
SHIPPING INFO
SHIPPING POLICY
Gas City Vapes offers same day shipping on all Domestic orders placed before 1pm MST with the exception of Holidays and weekends.
CANADA POST DISCLAIMER
Please note that Canada Post has resumed accepting and delivering parcels nationwide, following the recent labour disruptions. However, rotating strikes by the CUPW are still taking place in some regions, which may cause temporary delivery delays in affected areas.
Please allow extra time for your orders to arrive as delays are expected as we approach peak holiday volume.
If you need your order delivered more urgently, we recommend selecting Purolator at checkout for faster, uninterrupted service.
Last updated: December 3rd, 2025
If you do not see any available shipping options during checkout, please contact us directly so we can make alternative shipping arrangements for your order.
Proof of Age Required
Shipping in Canada
- British Columbia - Appx 3 Business Days
- Alberta - Appx 3 Business Days (Calgary = 1 Day, Edmonton = 2 Days)
- Saskatchewan - Appx 4 Business Days (Saskatoon & Regina = 3 Days)
- Manitoba - Appx 4 Business Days
- Ontario - NO SHIPPING
- Quebec - NO SHIPPING
- New Brunswick - Appx 8 Business Days
- Nova Scotia - Appx 8 Business Days
- PEI - Appx 8 Business Days
- Newfoundland - Appx 8 Business Days
- Nunavut - NO SHIPPING
- Northwest Territories - NO SHIPPING
- Yukon - Appx 13 Business Days
Please note all shipping times are appx and may be delayed if you live in a remote area of your province or if the shipping carrier has weather delays. If you require your package sooner than we offer with the free shipping option you can upgrade to Xpresspost for a fee and usually gets to you in half the amount of time.
United States Shipping
IMPORTANT UPDATES FOR U.S. CUSTOMERS
Due to the new U.S. Customs and Border Protection regulations, the way we ship orders to the United States is temporarily changing. Effective August 29, 2025, the U.S. has eliminated the duty-free exemption for all packages from Canada.
What This Means for Your Order:
New Orders (placed after August 28, 2025): We have temporarily suspended the ability to place U.S. orders directly through our website. We are actively working to implement a new system that will allow us to properly collect and prepay all required duties and taxes at the time of your purchase.
Orders Already Shipped (placed before August 29, 2025): IF your order was shipped before this change took effect, but has not arrived in the U.S., there's a significant risk of delay or refusal by U.S. Customs. Packages shipped under the old rules may be returned to us as non-compliant. Unfortunately, once a package is in transit, we have no control over its clearance process. We will monitor your tracking information and contact you immediately if we see any issues.
Need to Order Now? We're committed to serving our loyal U.S. customers. If you need to place an order and are having troubles or not seeing any shipping options at checkout, please contact us directly via phone or email. We will process your request manually and discuss any potential implications.
We sincerely apologize for any inconvenience this may cause and thank you for your patience as we navigate these complex changes. We appreciate your business and are working hard to make our U.S. shipping process as seamless as possible in compliance with all new regulations.
International Shipping Disclaimer
- You, the buyer, are responsible for any VAT, tariff, duty, taxes, handling fees, customs clearance charges, etc. required by your country for importing consumer goods. We do not collect this beforehand, and cannot give you an estimate of the cost - charges vary around the world.
- As an international consumer, please do your research to ensure there are no surprise charges when clearing your package through customs, and to have an idea of what the additional cost may be. If you are unfamiliar with customs fees and charges, please speak to your local postal or customs office for more information. It is your full responsibility to verify the customs, duties charges, and procedures in your country prior to placing your order.
- If customs fees and charges are refused at the time of delivery, your order will be returned and you will not receive a refund for shipment costs.
Delivery Timing
Gas City Vapes Inc. does not guarantee at any time a certain delivery date or time frame for delivery for any product or order. Any listed time for a shipping method is an estimate only. For orders with deadlines please order well in advance.
Shipping Terms
Gas City Vapes Inc. is not responsible for lost, misplaced, or delayed shipments or damaged freight by the freight carriers after they have been dispatched.
Gas City Vapes Inc. cannot be held responsible / liable for lost or stolen packages that have delivery confirmation to the address that was provided. The customer accepts full responsibility to file any claim(s) with carrier for damaged and/or lost shipments.
We are not responsible for mis-delivery errors via carrier, or incorrect shipping info.
If you have any further questions please feel free to contact us at
sales@gascityvapes.com
RETURNS & WARRANTY
Returns & Exchange Period
For hardware purchases, each product purchased directly from our website comes with a 30-Day Limited Warranty from the time of purchase. Please read below to see if you qualify.
Items not covered under our 30 Day warranty:
- Disposable Vapes
- Stlth Pods
- Replacement Coils
- Rechargeable Batteries
For sanitary and safety purposes, we will not accept returns on the following items.
- E-Liquid
- Disposable Vapes
- Atomizers / Tanks
- Stlth Pods
If a non-defective item is opened and used, we will not accept it back under any circumstances and they are not subject to a refund. If you change your mind about the product you received, you may return UNOPENED and UNUSED items for a full refund within 30 days of purchase. You will be responsible for the shipping charges to us. Shipping charges are NON-REFUNDABLE. You may not return e-juice, liquid products, or opened cartridges.
A 15% return processing fee may be applied if:
- Returns that are opened and/or non defective.
- Returns that show signs of physical damage or user error that could have caused the defect.
- Returns that are not cleaned and emptied prior to return.
- We may require a copy of photo ID before refunds in some cases.
Understand that if we make a mistake on a shipment, we will pay for shipping back to our facility. We will send you pre-paid postage to your email for you to return the product that was shipped incorrectly. Once we receive the wrong item shipped, we will ship the correct product to you. We cannot send your intended product until we receive the wrong product. UNDER NO CIRCUMSTANCES WILL WE SHIP ANY PRODUCT OUT BEFORE WE RECEIVE THE WRONG PRODUCT SHIPPED.
Warranty Service
For hardware purchases, each product purchased directly from our website comes with a 30-Day Limited Warranty from the time of delivery.
In order to be eligible for service under warranty, you must initiate a returns process by contacting us within 30 days of delivery date. The 30-Day Limited Warranty excludes coverage for damage resulting from accidents, abuse, disassembly, customized modification, or user-error. Furthermore, consequential and incidental damages are not covered under this warranty.
Note: Most manufacturers do require the warranty card that is included in the package and all original packing including outer sleeve in order to process the warranty service. Please do not dispose of the packaging contents as we will need all original packing for any warranty issues.
All "Dead on Arrivals" (DOA), Missing, Defective, or Wrong Item claims must be reported back to us within 48 hours from the time of delivery. Please inspect your items carefully upon receiving it, it is your responsibility to check within the time span and notify us of any problem. Minor scratches, cosmetic issues, and discoloration are considered normal wear and tear and is not covered by warranty.
We do not guarantee compatibility between items. If you have any questions about compatibility, please do your research or send us a question before placing your order. We will not accept returns due to incompatibility.
If you would like to submit a request for refund, replacement or exchange, please contact our returns department by email at sales@gascityvapes.com. Please provide your FULL NAME, ORDER #, PHONE NUMBER, and REASONS for the return. You may be requested to provide pictures or video proof of the issue. If the return is approved, you will receive further instructions on returning the package. Replacements are going to be shipped out after we receive the defective item back at our facility.
Note: Atomizers such as tanks, RDAs, RTAs, RDTAs, and pod systems purchased on our website are intended only for use with e-liquids. Any use of cannabis oil, cannabis-based substances, CBD oil, or similar liquids will void any warranty on our products and we will not accept it for a return.
Return Shipping Costs
In regards to the cost of shipment for returns, customer are responsible for the costs to ship the items back to us. Once we receive the items and approve the return, we will bear the shipping costs for the replacement items or issue the payments of the product if it is for a refund. ALL SHIPPING CHARGES ARE NON REFUNDABLE.
Refused Orders
If either customer or shipping carrier refused the packages for any reasons, there will be a 15% return processing fee along with shipping charge being non refundable. If you received free shipping, we will deduct our cost of shipping the package from your refund.
Refund Process
Refund may be issued back to the original payment (Credit card, debit card, etc) or as store credit in the form of reward points. Gas City Vapes is not responsible for refunds to a Prepaid Card in the event the cardholder no longer has possession of.
How to initiate a claim
Please email us at sales@gascityvapes.com with included information
- Your name, address, and phone number
- Order number, and date of purchase
- Please explain in detail what the issue is with the item
Efest Slim K2 Charger – Portable Dual-Slot Battery Charger for 18650, 20700 & 21700 Batteries
The Efest Slim K2 Charger is a compact, high-quality battery charger designed for vapers and device users who need fast, reliable charging on the go. Engineered with a dual-slot design, this charger independently monitors each battery to deliver a safe and consistent charge every time. With Micro USB input, 1A charging, and a lightweight build, it’s an ideal choice for anyone looking for a portable lithium battery charger for vaping devices, flashlights, and tools.
Each charging slot features an LED indicator to clearly show charging status and when your batteries are fully charged. The Slim K2 integrates multiple safety protections—including reverse polarity protection, short-circuit protection, and overcharge protection—to ensure your batteries stay safe throughout the charging process.
Compatible with a wide range of 3.6V/3.7V lithium batteries, the Efest Slim K2 Charger works seamlessly with popular sizes such as 18650, 20700, and 21700 batteries, making it a versatile option for electronic cigarettes, flashlights, and compact electronic devices.
| Feature / Specification | Detail |
| Compatible With | 10440, 14500, 14650, 16340, 16650, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 26500, 26650 |
| Design | Portable Design with Quality Piano Strings |
| Indicators | Battery Life LED Indicator Light |
| Charger Type | Dual Slot 5V/1A Micro USB Charger |
| AC Input Power | AC 100~240V 50/60Hz |
| DC Output Power | DC 5V 1A |
| DC Input Power | DC 5V 1A |
| 1A CC Current | 1000mA (+/-10%) |
| Auto Cut-Off Voltage | 4.20 (+/-0.05V) |
| CV Cut-Off Current | <100mA |
| Standby Current | <20mA |
| Activation Current | 50mA~100mA |
| Auto Recharge Voltage | 4.10 (+/-0.10V) |
| Operation Temperature | 0°C ~ 40°C |
| Storage Temperature | -40°C ~ 70°C |
SHIPPING POLICY
Gas City Vapes offers same day shipping on all Domestic orders placed before 1pm MST with the exception of Holidays and weekends.
CANADA POST DISCLAIMER
Please note that Canada Post has resumed accepting and delivering parcels nationwide, following the recent labour disruptions. However, rotating strikes by the CUPW are still taking place in some regions, which may cause temporary delivery delays in affected areas.
Please allow extra time for your orders to arrive as delays are expected as we approach peak holiday volume.
If you need your order delivered more urgently, we recommend selecting Purolator at checkout for faster, uninterrupted service.
Last updated: December 3rd, 2025
If you do not see any available shipping options during checkout, please contact us directly so we can make alternative shipping arrangements for your order.
Proof of Age Required
Shipping in Canada
- British Columbia - Appx 3 Business Days
- Alberta - Appx 3 Business Days (Calgary = 1 Day, Edmonton = 2 Days)
- Saskatchewan - Appx 4 Business Days (Saskatoon & Regina = 3 Days)
- Manitoba - Appx 4 Business Days
- Ontario - NO SHIPPING
- Quebec - NO SHIPPING
- New Brunswick - Appx 8 Business Days
- Nova Scotia - Appx 8 Business Days
- PEI - Appx 8 Business Days
- Newfoundland - Appx 8 Business Days
- Nunavut - NO SHIPPING
- Northwest Territories - NO SHIPPING
- Yukon - Appx 13 Business Days
Please note all shipping times are appx and may be delayed if you live in a remote area of your province or if the shipping carrier has weather delays. If you require your package sooner than we offer with the free shipping option you can upgrade to Xpresspost for a fee and usually gets to you in half the amount of time.
United States Shipping
IMPORTANT UPDATES FOR U.S. CUSTOMERS
Due to the new U.S. Customs and Border Protection regulations, the way we ship orders to the United States is temporarily changing. Effective August 29, 2025, the U.S. has eliminated the duty-free exemption for all packages from Canada.
What This Means for Your Order:
New Orders (placed after August 28, 2025): We have temporarily suspended the ability to place U.S. orders directly through our website. We are actively working to implement a new system that will allow us to properly collect and prepay all required duties and taxes at the time of your purchase.
Orders Already Shipped (placed before August 29, 2025): IF your order was shipped before this change took effect, but has not arrived in the U.S., there's a significant risk of delay or refusal by U.S. Customs. Packages shipped under the old rules may be returned to us as non-compliant. Unfortunately, once a package is in transit, we have no control over its clearance process. We will monitor your tracking information and contact you immediately if we see any issues.
Need to Order Now? We're committed to serving our loyal U.S. customers. If you need to place an order and are having troubles or not seeing any shipping options at checkout, please contact us directly via phone or email. We will process your request manually and discuss any potential implications.
We sincerely apologize for any inconvenience this may cause and thank you for your patience as we navigate these complex changes. We appreciate your business and are working hard to make our U.S. shipping process as seamless as possible in compliance with all new regulations.
International Shipping Disclaimer
- You, the buyer, are responsible for any VAT, tariff, duty, taxes, handling fees, customs clearance charges, etc. required by your country for importing consumer goods. We do not collect this beforehand, and cannot give you an estimate of the cost - charges vary around the world.
- As an international consumer, please do your research to ensure there are no surprise charges when clearing your package through customs, and to have an idea of what the additional cost may be. If you are unfamiliar with customs fees and charges, please speak to your local postal or customs office for more information. It is your full responsibility to verify the customs, duties charges, and procedures in your country prior to placing your order.
- If customs fees and charges are refused at the time of delivery, your order will be returned and you will not receive a refund for shipment costs.
Delivery Timing
Gas City Vapes Inc. does not guarantee at any time a certain delivery date or time frame for delivery for any product or order. Any listed time for a shipping method is an estimate only. For orders with deadlines please order well in advance.
Shipping Terms
Gas City Vapes Inc. is not responsible for lost, misplaced, or delayed shipments or damaged freight by the freight carriers after they have been dispatched.
Gas City Vapes Inc. cannot be held responsible / liable for lost or stolen packages that have delivery confirmation to the address that was provided. The customer accepts full responsibility to file any claim(s) with carrier for damaged and/or lost shipments.
We are not responsible for mis-delivery errors via carrier, or incorrect shipping info.
If you have any further questions please feel free to contact us at
sales@gascityvapes.com
Returns & Exchange Period
For hardware purchases, each product purchased directly from our website comes with a 30-Day Limited Warranty from the time of purchase. Please read below to see if you qualify.
Items not covered under our 30 Day warranty:
- Disposable Vapes
- Stlth Pods
- Replacement Coils
- Rechargeable Batteries
For sanitary and safety purposes, we will not accept returns on the following items.
- E-Liquid
- Disposable Vapes
- Atomizers / Tanks
- Stlth Pods
If a non-defective item is opened and used, we will not accept it back under any circumstances and they are not subject to a refund. If you change your mind about the product you received, you may return UNOPENED and UNUSED items for a full refund within 30 days of purchase. You will be responsible for the shipping charges to us. Shipping charges are NON-REFUNDABLE. You may not return e-juice, liquid products, or opened cartridges.
A 15% return processing fee may be applied if:
- Returns that are opened and/or non defective.
- Returns that show signs of physical damage or user error that could have caused the defect.
- Returns that are not cleaned and emptied prior to return.
- We may require a copy of photo ID before refunds in some cases.
Understand that if we make a mistake on a shipment, we will pay for shipping back to our facility. We will send you pre-paid postage to your email for you to return the product that was shipped incorrectly. Once we receive the wrong item shipped, we will ship the correct product to you. We cannot send your intended product until we receive the wrong product. UNDER NO CIRCUMSTANCES WILL WE SHIP ANY PRODUCT OUT BEFORE WE RECEIVE THE WRONG PRODUCT SHIPPED.
Warranty Service
For hardware purchases, each product purchased directly from our website comes with a 30-Day Limited Warranty from the time of delivery.
In order to be eligible for service under warranty, you must initiate a returns process by contacting us within 30 days of delivery date. The 30-Day Limited Warranty excludes coverage for damage resulting from accidents, abuse, disassembly, customized modification, or user-error. Furthermore, consequential and incidental damages are not covered under this warranty.
Note: Most manufacturers do require the warranty card that is included in the package and all original packing including outer sleeve in order to process the warranty service. Please do not dispose of the packaging contents as we will need all original packing for any warranty issues.
All "Dead on Arrivals" (DOA), Missing, Defective, or Wrong Item claims must be reported back to us within 48 hours from the time of delivery. Please inspect your items carefully upon receiving it, it is your responsibility to check within the time span and notify us of any problem. Minor scratches, cosmetic issues, and discoloration are considered normal wear and tear and is not covered by warranty.
We do not guarantee compatibility between items. If you have any questions about compatibility, please do your research or send us a question before placing your order. We will not accept returns due to incompatibility.
If you would like to submit a request for refund, replacement or exchange, please contact our returns department by email at sales@gascityvapes.com. Please provide your FULL NAME, ORDER #, PHONE NUMBER, and REASONS for the return. You may be requested to provide pictures or video proof of the issue. If the return is approved, you will receive further instructions on returning the package. Replacements are going to be shipped out after we receive the defective item back at our facility.
Note: Atomizers such as tanks, RDAs, RTAs, RDTAs, and pod systems purchased on our website are intended only for use with e-liquids. Any use of cannabis oil, cannabis-based substances, CBD oil, or similar liquids will void any warranty on our products and we will not accept it for a return.
Return Shipping Costs
In regards to the cost of shipment for returns, customer are responsible for the costs to ship the items back to us. Once we receive the items and approve the return, we will bear the shipping costs for the replacement items or issue the payments of the product if it is for a refund. ALL SHIPPING CHARGES ARE NON REFUNDABLE.
Refused Orders
If either customer or shipping carrier refused the packages for any reasons, there will be a 15% return processing fee along with shipping charge being non refundable. If you received free shipping, we will deduct our cost of shipping the package from your refund.
Refund Process
Refund may be issued back to the original payment (Credit card, debit card, etc) or as store credit in the form of reward points. Gas City Vapes is not responsible for refunds to a Prepaid Card in the event the cardholder no longer has possession of.
How to initiate a claim
Please email us at sales@gascityvapes.com with included information
- Your name, address, and phone number
- Order number, and date of purchase
- Please explain in detail what the issue is with the item
EFEST SLIM K2 DUAL BATTERY CHARGER FAQ
Get answers to questions frequently asked about the EFEST SLIM K2 DUAL BATTERY CHARGER.
What batteries can the Efest Slim K2 Charger charge?
The Slim K2 supports most 3.6V/3.7V lithium batteries, including popular vape battery sizes like 18650, 20700, and 21700, as well as batteries for flashlights and electronic tools.
Is the Efest Slim K2 safe to use for vaping batteries?
Yes. It includes multiple safety features—reverse polarity, short-circuit, and overcharge protection—making it safe and reliable for charging vape batteries.
Does the Slim K2 Charger show when the battery is fully charged?
Each slot has an LED indicator that turns green when the battery is fully charged and red while charging.
How fast does the Efest Slim K2 Charger charge batteries?
It charges at 1A per slot, offering a balanced blend of speed and battery health for most lithium cells.
Can I use the Efest Slim K2 with a power bank or USB wall adapter?
Yes. The Slim K2 uses Micro USB input, so it can be powered by a wall adapter, power bank, or any compatible USB source.
