AGM Batteries Do Not "Dry Out" Unless Physically Damaged
- AGM batteries do not dry out unless violently mistreated
- The batteries are sealed
- Special battery caps recombine oxygen and hydrogen and precipitate it back onto the glass mat
- Special relief valves built into the cap maintain pressure within the battery until a threshold is reached
- The caps then pop open, release pressure then automatically reseal: In practice it takes upwards of high 16's into the 17's of voltage to build up enough pressure to cause venting
- Prolonged excessive charging causes positive plates to shed
- It is because electrolyte in an AGM is extra potent 1.300 that the battery is sensitive to excessively high voltage.
