Model Name: LI-PRO1U
Rechargeable Lithium Ion Battery with Case and Charger
4300mAh 4 cell lithium ion battery for ZIPPKOOL Products (Compatible with all cooling jacket models and helmet cooler models).
With four power level settings, the battery provides up to 24 hours of continual usage and up to five year battery life. One year full warranty included
"When I bought the cooling vest I went with the AA battery powered power source. I was happy with the cooling abilities of the vest but I did not get the power or run time I was looking for. I decided to try this rechargeable pack and boy was I surprised at the output to the fans. I run on a low setting when I first start work and midway threw my shift I kick it up to high to give me the boost I need to get threw the day. A++"