Comment on Workbench tale: Resurrection of a dead Emlid Reach RS+ due to extremely low battery
MigratingApe@lemmy.dbzer0.com 3 weeks agoThanks for sharing this.
It looks like the cutoff voltage for LiFePO4, the minimum voltage after which there should be a total power cutoff is around 2.8V. Discharging further is equal to more or less serious, but always, damage to the cell. It also looks like the effects of such over discharge might be less serious for LiFePO4 than it is for Li-Ion cells. However… doesn’t this 1500$ device have a Battery Management System, BMS, a small circuit to implement the cutoff voltage? What the hell?
troyunrau@lemmy.ca 3 weeks ago
Yeah, there is risk of some chemistry happening at really low voltages which cause irreversible changes to the structure of the material. Given how the battery responded to tests afterwards, I can only presume that these didn’t happen. Short of dissecting the cells and putting them through XRD. Mind you, I do know a few people in the lab…