amir mirmir

Its definitely a lithium ion, and it had a sticker that said this:

Discharge:
Max. voltage 16.8V
Nom. voltage 14.8V
Min. voltage 10.5V

Charge method (CCCV):
Charge voltage: 16.8VDC max.
Recommended charge current: 5A max

so i tried just plugging a dc 12v charger to the positive and negative and it didn't worked. maybe it has to do with the middle hole

i have bought a military battery at a yard sale and i want to use it as a backup battery, i have successfully discharged from it using the positive and negative holes but i cant seem to charge it using the same method can anyone try to help me?

thanks



the positive is the upper hole and the ground is the bottom hole, does anyone know whats the hole next to the negative is for?