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The best way to charge batteries when they have been depleted is to use a 2 amp charger. I had an Interstate battery in my antique pickup for 14 years. My failure to check the battery voltage frequently lead to near complete discharge several times. Each time it charged and held the charge. It takes a few days at 2 amps, but charging at a high rate will overheat the batteries and boil the water out of them. And they will emit explosive gasses. A spark near the batteries may ignite the gasses and blow up the battery. I learned this the hard way about 50 years ago, when I didn't know anything about batteries. One blew up in my face. Luckily I was very close to a water faucet and my glasses protected my eyes. Always disconnect battery leads after the charger has been turned off. Hope this helps someone.
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