[time-nuts] time-nuts Digest, Vol 194, Issue 36 Lead acid?

[Andre]

Re. OP mentioning battery back up.
Just a thought but a lot of places who maintain UPS units have a lot of surplus batteries that are often in
reasonable shape.
If you're careful and bring a multimeter its possible to snag a good unit which has lost capacity but otherwise
works and techniques exist to rebalance units that have failed due to one or more cells going bad.
I discovered by accident that taking a SLA that has failed for this reason and *carefully* discharging it from
5-8V to zero over a week then recharging from small solar cell voltage limited to 14.0V will sometimes
bring it back: reversed failures on two units from E bikes like this.
I actually determined that the repaired NP12-12 was almost as good as a new pack with only marginally
higher internal resistance according to meters.

-A
________________________________________
From: time-nuts <time-nuts-bounces at lists.febo.com> on behalf of time-nuts-request at lists.febo.com <time-nuts-request at lists.febo.com>

------------------------------

End of time-nuts Digest, Vol 194, Issue 36
******************************************