When this happens, you should entirely desulfate the battery so that it once more holds a charge. Desulfation is likewise called battery "reconditioning." Since batteries have toxic chemicals, such as lead acid, you need to take safety and security precautions. Constantly put on goggles and gloves when executing this procedure. https://andresptswv.dailyhitblog.com/40550158/h1-ez-battery-reconditioning-evaluation-can-you-re-use-old-batteries-h1