I bought some new Trojan T105's and found that one of them shows a slightly lower state of charge than the others. Is this likely to affect the performance of the whole bank?
While still in the garage, I charged them in 12V pairs and then let them rest, but one was 0.04V lower than the others. So I charged that again with the next lowest one, letting the pair float for a day. As soon as they were disconnected, the suspect one still showed a slightly lower voltage, and now a week later it's back to 0.04V lower again. Temperature is around 25 degrees C.
The actual reading is 6.33V, although I am aware cheap
multimeters may not be accurate. The SG reads 1.280-1.285 compared to around 1.300 for the others. Both these readings seem fine according to Trojan's User Guide, and the variance is well under their 0.3V guideline for equalizing.
But their table also shows this one battery
is 5% less charged than the others. Won't this tend to drag the others down to its level when they are connected together?
They were all fresh from the distributor, and stamped with the same dates. I don't yet have the equipment
to equalize (to be installed in 2-3 months), otherwise I would do so, but should I have to for new batteries anyway?