FYI the correct type of battery you are mucking around is call SLA, and please be careful with these low energy density batteries, make sure the charging space is well ventilated, wear protection glasses when disconnecting them from charger and while moving them after high current charge.
If washing basing is far away Please have a big bottle of fresh water around for wash off purpose.
You will thank me for this reminder as you are mucking around with more then 120 unit of Chinese made SLA.
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