Watch dog battery backup10/5/2023 In some systems this is as simple as a strip of mesh fabric like red scotch bright secured over the cells it needs to be acid resistant because a large component of batteries is sulfuric acid. Open cell or vented batteries require a flame arrestor (see NEC 480.11). The risk of explosion is very low with both battery types unless overcharged. These batteries are not designed to be refilled. ![]() ![]() The seal is accomplished with a rubber (or silicone like material) over the port and usually a plastic shield welded in place to keep the seals in place. Even sealed batteries discharge some hydrogen gas when charged-they have to release the pressure or they will break the case.
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