First, stop the regular maintenance charging of the battery, and then discharge it at a rate for 2 hours. During the discharge process, measure the voltage of the battery from time to time and select the “backward” batteries with insufficient discharge capacity for disposal. First, add 1.050 dilute sulfuric acid until the appearance is just beautiful and active electrolyte appears, then continue charging for 12 to 15 hours. When charging, be careful not to let the battery temperature exceed 500 ° C. After charging is complete, let it stand for 0.5 to 4 hours and then perform a 2-hour rate discharge. During the discharge process, measure the value of the single-cell voltage. If the discharge time does not meet the standard or the single-cell voltage reaches 1.6V, and the discharge time differs significantly from that of a normal single-cell battery (more than 5 minutes after three months of production, more than 8 minutes after six months, and more than 10 minutes after nine months), If the difference is more than 15 minutes within 13 months, the above-mentioned charging and discharging procedures still need to be repeated until the requirements are met.
If after repeated charge and discharge cycles, the battery capacity does not increase significantly or remains at around 0V low voltage, this battery usually has a short circuit, or the active substances are severely lost and softened, or there is severe irreversible sulfation, etc. Severe sulfation can stop its activation, and other damages should be scrapped. For batteries that meet the requirements and can continue to be used, under the charging condition of a constant voltage of 15V per battery, the active electrolyte should be drained completely, the battery surface should be wiped clean, the cap valve should be installed, and the panel should be bonded well with PVC (or chloroform) adhesive.
Post time: Jan-05-2026