How can I tell when my SLA batteries are charged?
I have three, 12v, 22ah SLA batteries wired in series to make a pack that is 36v and 22ah. The charger I have is the very crude kind which is essentially just a transformer. It says it outputs 36v at 1.6a. The batteries are empty, this will be the first time I am charging them. How can I tell when then are finished charging? Can I use a multimeter? If not, then what? Thank you in advance for your help.