Double check that the individual battery is reverse charged.  Isolate the battery. Discharge it with a resisti e load, like a car headlamp.  Put it on a 6v charger to see if it will recover. 



Sent from Samsung Galaxy smartphone.


-------- Original message --------
From: Mike Finck via Elec-trak <elec-trak@cosmos.phy.tufts.edu>
Date: 4/22/23 10:24 AM (GMT-05:00)
To: elec-trak@cosmos.phy.tufts.edu, noaddress@drmm.net
Subject: Re: (ET) battery gases

Sirs,I am on an "old man" streak . Turns out I installed one of the batteries (lead acid) backwards and charged the pack for about 6 hours and of course had no real power. Studied the installation and found the problem (me)! I disconnected it but now I am uncertain of my next step. With red tester lead on + post and black on - post shows "6.2v", reversing the leads shows "-6.2v" so I'm thinking the polarity did not reverse.  Should I charge it separately for awhile or just reinstall it among the pack and start charging (and thank my lucky stars)?
Again, thanks for your collective expertise.Mike
    On Wednesday, April 19, 2023 at 05:45:16 PM EDT, David Roden <etpost@drmm.net> wrote: 

On 19 Apr 2023 at 14:27, Darryl McMahon wrote:

> There used to be a battery shop in my area that had the molds and
> equipment to reform/recast a damaged battery post, but they have been
> gone for years. I don't know if this is even done anymore.

A few of the old-timers on the EV Discussion List used to recast battery
terminals in their own garages.  They wrote about it and here's an edited
version of the thread.  Not to be a downer, but sorry to say 2 of the 3
writers, Bob Rice and Roland Wiench, are no longer with us. 

http://evdl.org/pages/battpost.html

Note that I don't really recommend trying this yourself. The writeup is
mainly intended for information and entertainment.  To find an expert in
the recasting and/or repair process, try industrial battery suppliers. 


David Roden - Akron, Ohio, USA

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