Something in my bike (USB Charger, Hella Socket itself) has made a short circuit leading to deep discharge of Lead-Acid battery.

Battery was down to 5.2V for time counted in minutes. I've disconnected load sources and recharged the battery using recovery function.

Now battery keeps at quite rock-solid 12.6-12.4V, but I'm wondering how much damage this undervoltage could made? Was there enough time to create thick Sulfur coating on electrodes?

  • \$\begingroup\$ You should mention that this is apparently a 12 V battery. Without that information, there is no way to judge what 5.2 V means. \$\endgroup\$ – Olin Lathrop Nov 6 '17 at 11:55

Your battery has most likely lost some capacity. If this is a "car" battery, then it is probably significantly damaged. If it is a industrial battery with "deep cycle" capability, then it should be less damaged.

Read the datasheet. If this is a consumer item that doesn't have a datasheet, assume significant damage.

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