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I think it depends on usage, we have had a system here at the house, I had 10 locked together tight, I will take a picture of the distorted battery case, I used mine for days on end, recharging with a battery charger.
I guess that is why they recommend a battery temperature sensor, mine did got hot here at the house.
It all boils down to making the batteries last as long as possible and being as efficient as possible. I imagine most systems work just fine.
My overheated, distorted warped battery cases lasted 10 years, but they look funny...
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