This contains two assertions:
(1) batteries could only have frozen if there were left completely discharged for a long time
(2) they would have inevitably have been destroyed prior to freezing through being left discharged and consequent sulphation
While I agree that my batteries were not fully charged, I can show that they had a SOC of at least 40% and possibly 50% based on OCV. The fact that they froze at ~ -27C implies the SOC was somewhere in the 55% to 65% range. They were definitely not discharged completely, much less left that way for an extended period. FLAs can in fact freeze with an acceptable, if non-optimal, SOC and be destroyed by freezing before they are in danger from sulphation.
It would have been better if my batteries were fully charged, of course. But non-ideal circumstances does not imply total neglect or complete design failure. There are interesting things to learn about low temperature performance of FLA batteries that simple assertions of "abuse" doesn't cover.
(1) batteries could only have frozen if there were left completely discharged for a long time
(2) they would have inevitably have been destroyed prior to freezing through being left discharged and consequent sulphation
While I agree that my batteries were not fully charged, I can show that they had a SOC of at least 40% and possibly 50% based on OCV. The fact that they froze at ~ -27C implies the SOC was somewhere in the 55% to 65% range. They were definitely not discharged completely, much less left that way for an extended period. FLAs can in fact freeze with an acceptable, if non-optimal, SOC and be destroyed by freezing before they are in danger from sulphation.
It would have been better if my batteries were fully charged, of course. But non-ideal circumstances does not imply total neglect or complete design failure. There are interesting things to learn about low temperature performance of FLA batteries that simple assertions of "abuse" doesn't cover.
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