On 07/04/2021 10:32, GB wrote:


I think that one issue could be that the two batteries were NOT exactly
the same voltage to begin with. They have low internal resistance, so
even a small voltage difference between them could drive rather large
currents through them.

I think it would be better to charge them separately in future.

That is my thought - Voltages were not going to match
One was a new 170 Ah
The other a 9 yr old 74 Ah