Aging of RAID batteries for Dell R710

Hello,

We keep stock of RAID batteries for PERC6/i cards. I believe they are quite old. Some have manufacturing dates on the labels and newest ones that I've found are from 2010-2011. I am fairly certain that no special storage procedures were followed (like periodical recharging) and they were just kept in a box since purchase. It's unlikely they were pulled out of a decommissioned server.

I wanted to ask if these would still work and not fail after e.g. two months. Is there a way to test them? Are there special storage procedures that need to be followed? I've heard that if batteries like these discharge completely they cannot be charged anymore.

Thanks,

Pawel