Lead-acid gel batteries are considered safer than regular fluid-filled lead-acid batteries. each battery cell contains a thick gel, if the battery gets dropped or damaged and the case splits open, the gel remains in place, whereas a fluid-filled battery would leak dangerous sulfuric acid.. Gel batteries are considered to be safer, because if the casing gets damaged the gel doesn't spill, but fluid-based batteries can leak sulphuric acid, if the casing gets damaged. gel batteries are sealed units, so unlike fluid-based batteries you cannot access the cells.. I got a couple of rather large gel-cell batteries the other day (the largest is a 12v 24ah) but it turns out they weren't such a great find. neither will take a charge; with the charger connected, neither battery will.
Utility substation battery systems, substation battery banks
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Stationary batteries and standby power batteries