How to Reactivate a Battery That Has Been Stored for Two Years?

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Use a repair device to reactivate. Check water level: First, check if the battery is short of water. If it is, add an appropriate amount of distilled water, then use a charger to recharge. Increase voltage: If the battery voltage is below 10V, the battery cannot be charged, which is commonly referred to as 'dead'. In this case, use a repair device to reactivate it. The high-resistance repair function of the repair device can increase the battery voltage back to above 10V, allowing the battery to be charged. During storage, a car battery loses about 1% of its charge per day, which is the self-discharge rate of the battery. If the battery is stored for too long, it will gradually lose charge. The longer the battery remains idle in a discharged state, the more severe the damage will be, eventually leading to complete failure.