5.5 x 2.1 mm plug. UL/FCC/CE/RoHS approved. Only use for 12V 12.8V LiFePO4 battery pack, charge to 4S 9V-14.6V Rechargeable Lithium Iron Phosphate Battery Pack. Attention please: It can't charge for 3S 12V rechargeable lithium ion battery pack. AC/DC Charger: Input: AC 100-240V 50/60Hz. Output: DC 14.4 14.6V/1.5A. Inner Positive(+), Outer Negative(-). Alligator Clip Connector: Red is connected to the positive. Black is connected to the negative. Comes with LED charging indicator, LED Display Red: Charging ,Green: Charged OK. Warning: Only charge for 4S 12V LiFePO4 Battery. It can't use for 3S 12V li-ion battery pack. Suitable for TalentCell 12V series LiFePO4 batteries, model LF120A1/LF4011/LF4021/LF4100/LF4040 and more, and other 4S 12V lithium iron phosphate battery pack. Compatible with 12V sealed lead acid (SLA) batteries. Battery voltage range is 9-14.6V. Package: 1 x 14.4V/1.5A Charger. 1 x Dual Alligator Clips Connector. Please note: it can't charge for 3S 12V li-ion battery pack. AC/DC Charger:
Input: AC 100-240V 50/60Hz. Output: DC14.6V/1.5A. Inner Positive, Outer Negative.

Alligator Clip Connector:
Red is connected to the positive. Black is connected to the negative.

During charging, indicator lamp appears Red, when fully charged, it appears Green. Once fully charged, please pull it out in time.

It's used to charge the lithium iron phosphate (LiFePO4) battery pack. Battery voltage range is 9-14.6V.
Please note: it can't charge for 3S 12V lithium ion battery pack. Battery voltage range is 9-12.6V.
Don't always connect the power socket if you don't use the charger.