1. Unclasp the velcro from the inside of the wrist cuff on the glove.
2. Gently pull out the battery pack.
3. Locate the small disk-like drive at the back of the battery pack. Put your fingernail in the groove and pop the battery tray out.
4. Stack 2x CR2020 batteries on top of each other with the + side facing up.
5. Place the batteries in the tray and close.