https://www.sbsbattery.com/PDFs/VRLAThermRunawayStorageBatterySystems.pdf
They tested constant voltage float charging at various voltages and ambient temperatures trying to trigger thermal runaway in 24V battery packs. Sounds super fun except for the hot messes they must have made. Some points I found interesting from the results: * The threshold for thermal runaway varies a lot between manufacturers. The worst ones did it at 28V and ~40C or 29V and ~30C * That 29V & 30C is not impossible. * The best performers in this test would not have a thermal runaway in any realistic temperature with any voltage you'd get from a rectifier. * The threshold drops with age and condition of battery. * "thermal runaway would not happen at 27 volts in any of the batteries regardless of temperature"
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