Summaries and updates.
(I have named the batteries in order of SOC when I got them, which is not the order I messed with them in. May be a bit confusing, but to me it makes sense!)
A:
12.68 when got it.
Third one to charge.
7-8 amps start at 12.70. Went down to 12.61, up to 10 amps, 105 degrees. 10 mins later got higher, and hot to the touch, so disconnected.
Mex said may be bad cell, let it sit and check voltage without charge next week
12.83 today.
B:
Did this one second.
12.66 before start. Only took an amp or 2 to start, amps increased to about 3, then decreased again. Took it off 3.5 hrs after stabilized, 4.5 hours after start.
After sitting overnight, only 12.87.
12.80 today.
C:
Did this one first. 12.47 before I began.
Nearly 29 amps at 12.70 to start. Did not realise volts would keep rising. 15.20 after an hour, fiddled it down to 12.67, 15amps, but then disconnected bec uncertain.
12.97 in am so did not charge more.
Next day, 12.94 after about 40 hours rest. Put it at 14.74v, took 3-4 amps, for 4 hours, not warm, then increased amps. End of the run was at 12.68v, 6.3 amps, and barely warm
13.04 today, a week later. Lookin' good!
D:
Have not touched this one yet. 12.35 when it arrived, and today.
