Efest Slim K1 Battery Charger

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Sale price$ 13.74 Regular price$ 19.99

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Efest Slim K1 Battery Charger

If you are looking for a reliable, cost-efficient, and high-quality charger, then Efest Slim K1 is designed for you. You can simply use it while on the go. Introducing a number of safety features (overcharge protection, short circuit, reverse polarity and etc) and an LED indicator showing when the battery is fully charged or is in the way of charging. The Efest Slim K1 can also be used to charge other types of 3.6V/3.7V lithium batteries, which are being utilized in flashlights, electronic cigarettes and etc. 

Features & Specification:

  • Portable Design with Quality Piano Strings
  • Battery Life LED Indicator Light
  • Single 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: 0C ~ 40C
  • Storage Temperature: -40C ~ 70C

Compatible with: 3.6V/3.7V Lithium-ion Batteries, Most Cylindrical Lithium-ion Batteries Ranging In Size of 10440, 14500, 14650, 16340, 16650, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 26500, 26650

Package Content:

  • 1 x Efest Slim K1 Charger
  • 1 x Micro USB Cable
  • 1 x User Manual

Use Rechargeable Batteries or With PCB Batteries. Other types of batteries may cause personal injury. Do NOT leave batteries charging unattended/overnight! 

NOTE: Use special caution when working with Li-ion cells, they are very sensitive to charging characteristics and may explode or burn if mishandled. Make sure the user has enough knowledge of Li-Ion rechargeable batteries in charging, discharging, and assembly before use. Always charge in/on a fire-proof surface. Never leave charging batteries unattended. We are not responsible for damage if there is any modification of the batteries/chargers in any form or shape (including pack making). We are not responsible for any damage caused by the misuse or mishandling of Li-Ion batteries and chargers. We only recommend using Lithium Ion rechargeable batteries with a control circuit (protection PCB) to assure safe charge, discharge, etc, use of lithium-ion batteries with a protection circuit is potentially hazardous. Batteries are not included.


Efest produces and offers vape battery chargers, rechargeable batteries, and other related accessories for vape devices. these products are known for their high quality, eco-friendliness, modernity, compatibility, and many more qualities. Equipped with innovative designs and smart factors, Efest's products are highly recommendable for use.   

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Customer Reviews

Based on 1 review
Great Charger.

Very pleased with the purchase.

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