The Efest Slim K1 Charger is a high quality with a cost-efficient and portable design. The Efest Slim K1 Charger is a single slot charger with Micro USB input and charges at 1A. The LED indicates when your battery is charging and when the battery is fully charged. Unleash the full potential of your batteries with the Efest Slim K1 Battery Charger! With its compact and efficient design, this single slot charger boasts a 1A charging speed and a convenient Micro USB input. You'll always know when your batteries are ready for action with its LED indicator. Say goodbye to waiting and hello to adventure - charge on the go with the Efest Slim K1 Battery Charger!

Boost your charging game with the Efest Slim K1 Charger! Designed for thrill-seekers who never back down from a challenge, this charger offers reverse polarity, short circuit, and overcharge protection. Get ready to conquer any adventure with its ability to charge various 3.6V/3.7V lithium batteries, perfect for electronic cigarettes, flashlights, electric tools, and more. Don't wait, take charge now!

Features and Specs:

• Compatible with: 10440, 14500, 14650, 16340, 16650, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 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