The Efest Slim K1 Charger is a high-quality and cost-efficient charging solution for your single rechargeable battery. Designed with portability in mind, this charger offers a compact and lightweight design that is perfect for on-the-go use.

With its Micro USB input, the Efest Slim K1 Charger provides convenient charging options. It charges your battery at a 1A charging current, delivering a balanced and efficient charging process to ensure optimal battery performance.

The LED indicator on the charger keeps you informed of the charging status. It illuminates when your battery is charging and turns off when the battery is fully charged, providing a clear visual cue for your convenience.

Safety is a top priority with the Efest Slim K1 Charger. It incorporates various protection features, including reverse polarity protection, short circuit protection, and overcharge protection, ensuring the safety of both your battery and the charger itself. You can charge your battery with peace of mind, knowing that it is being handled with care.

The Efest Slim K1 Charger is compatible with a wide range of 3.6V/3.7V lithium batteries commonly used in electronic cigarettes, flashlights, electric tools, and more. Whether you need to charge a battery for your vape mod, flashlight, or other devices, this charger offers versatility and compatibility.

Warning:  Misusing or mishandling lithium-ion batteries can pose a SERIOUS RISK of property damage, personal injury, or even death. They are not supposed to be used outside of a fully protected battery pack and you use them at your own risk. Never exceed the battery’s true continuous current rating and keep the plastic wrap and top insulating ring in perfect condition.


  • Compatible with: 10440, 14500, 14650, 16340, 16650, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 26500, 26650
  • 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

Package Contents

1 x Efest Slim K1 Charger
1 x Micro USB Cable

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Written By: Anonymous
Posted: 23-01-2023

"Great little charger!"

For the cheapest charger I could get its very compact has clear led charging light and decent charging!

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