I would second what Cal said, that it is not a good practice to mix different aged batteries in a series string. They won't share the current equally, the newer batteries will be stressed with greater current and the older batteries will pull the total voltage of the string down causing more voltage drop on the good batteries.
We are pretty aware of the need to monitor battery voltage. What we do not do so much is monitor battery temperature. Batteries getting hot are a symptom of problems and should be monitored. A lot of us are using lead acid batteries. For good battery life, and to avoid thermal runaway, the charge voltage should be adjusted for battery temperature. Not the ambient temperature (although that will affect battery temperature) but by putting a temperature sensor on the battery terminal which is the closest you can measure to core temp. I have not studied it but suspect the same conditions apply to discharge. With the operating currents of our boat motors it might be something to look into. But at least sensors on the batteries for an overtemp alarm would be appropriate.
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Posted by: John Acord <jcacord@gmail.com>
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