Mark F.,
Your intent is similar to my 2000 Honda Insight with 370K miles and still its first traction battery pack of NiMH cells. So there is evidence of longevity in your plan.
NiMH cells are sometimes even helped by over- and under-charging, "top" balancing and "bottom" balancing. Most Lithium tech batteries rapidly chemically degrade internally with either high or low voltages. NiMH are different; they tolerate long gentle (less than 300mA for more than 3 days) overcharges, as long as they don't build up heat. This makes packs easy to top balance (a "grid charger" in Insight-speak). Some Insight owners even rejuvenate their traction battery packs with intentional sequential high-low-high-low.... cycles bursting to 30 Amps ("pack wacker").
Old Insights use just 3 temp/voltage probe taps on their 175Voc series packs, or one tap every 10 or 15 cells (I forget nominal voltage and cell count).
Just know your plan is not perfect, but could help identify weaker strings of cells.
Mark S.
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Posted by: mstafford@natca.net
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