Battery Acid SG



I am about to fill some large 2v traction batteries and wonder whether
to use 1260 or 1280 acid. I understand that 1280 acid will enable me
to pull higher discharge rates but at the expense of battery life. The
batteries' original spec was for 1280 acid, but then they were being
discharged with a 5000 amp demand. I am more interested in battery
life, so I am tending towards the 1260 option.
Any thoughts??

.



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