This 4 bay charger is designed to charge 3.7V Li-ion batteries only.

• Nice display screen showing voltage of cells
• Can charge 10440, 14500, 16340, 16350, 16500, 17335, 17500, 17570, 18350, 18490, 18650, and 26650 batteries. (20700 and 21700 are a very tight fit and will damage the battery wrap, they do fit but not recommended. The FC2 or R2 or Q4 are a much better choice for these longer cells). 
• Comes with wall adapter and a 12V car adapter.
• Includes a single USB port to transfer power from a battery into whatever is plugged into the USB port.
• Over-voltage, over-discharging, short-circuit and reverse polarity protection.
• Option to charge using 0.5A or 1.0A through all 4 slots or 2.0A on 2 of the slots via the button on the front of the charger.

Disclaimer: Do not leave batteries unattended while charging as this may result in damages.

Please see our Blog about Battery Safety <HERE>

⚠WARNING:

• Misusing or mishandling lithium ion batteries can pose a SERIOUS RISK of personal injury, property damage, or death
• BATTERIES MAY EXPLODE, BURN, OR CAUSE A FIRE IF MISUSED OR MISHANDLED
• ONLY use with proper protection circuitry
• ONLY use within manufacturer specification
• DO NOT store loose in pocket, purse, etc. – always use a protective case
• KEEP AWAY from metal objects to prevent short circuiting
• DO NOT short circuit
• DO NOT use if wrapper or insulator is damaged or torn
• DO NOT use if damaged in any way
• DO NOT overcharge or over-discharge
• DO NOT modify, disassemble, puncture, cut, crush, or incinerate
• DO NOT expose to liquids or high temperatures
• DO NOT solder
• User must be familiar with handling lithium ion batteries before purchase
• Usage of batteries is AT YOUR OWN RISK

Local regulations and laws pertaining to the recycling and disposal of lithium ion batteries vary so please consult your local jurisdiction regarding appropriate disposal.