Guys, I'm brand new to your forum, but I thot someone might be able to help me determine if I should try to use some Evertroll NiZN batteries in my small EV that I'm building. I was given (free) 8 of these 12v batteries. They were at various states of discharge from 12.15v to 6v. I charged then using my auto battery charger and most of them came up to and hold at 11.3-11.8v. This battery was designed for electric trolling motors and each battery had a removable battery management charger installed on the top that plugs into a 120v socket. I have 1 (non-functioning) BM charger, but I may be able to find some more.
Here's some comments I found on a website:
Evertroll batteries cannot serve as cranking batteries because they can’t be charged by the engine’s alternator. They can only be charged with the special AC charger included with each battery.
I just learned of PowerGenix, who is developing a Nickel Zinc battery (NiZN). It's interesting to see a new company try and develop this chemistry, after the spectacular failure of Evercel.
According to the MB100-12 owners manual, these batteries are capable of of 15.6v max and as low as 7.6v. They are 85Ah and can be rapidly discharged up to 400A. They only weigh about 45 lbs and are a group 31 size (12"L x 7"W x 9"H). The manual says that they can go to sleep if not used (as in my case), and need to be discharged and recharged 3 to 5 times to wake them up. It says to charge them for 550 minutes at 11 amps using a constant current (CC) charge method which my auto charger can do.
What can I use for a charger if I can't find the originals? How should I discharge these? Are they useable if I can get them up to only 12-13v? I plan to use a 72V system, so I assume they all need to be equal.
Thanks for your help.
p.s. I'm a member of SEVA (Seattle EV Assoc)if anybody is in this area.