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Q: How long can a 80 amp battery last when you use 0.5 amp?
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Not at all. A 35 amp charger is far too large to charge a lawn mower battery. Use a 10 amp automatic charger.


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How long does it take to charge a lawn mower battery?

With a 10 amp charge about 1 hour if the battery is totally dead. You should really use an automatic battery charger that shuts off when the battery is fully charged to avoid overcharging.


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Can you use a 12v 12ah battery instead of a 12v 8ah battery?

The Ah (amp hour) rating of a battery is a measure of it's capacity. A 33Ah battery, when fully charged, will deliver 33 amps for one hour, or 11 amps for 3 hours, etc.A 7 Ah battery will only last about 20% as long as a 33Ah battery.


What are the difference that a battery charger overs 10 amp vs 2 amp?

The difference is the amount of energy the charger will put into the battery over a given amount of time. A 2 amp charger is great to use to keep a battery charged when it is in storage. A 10 amp is used to recharge a battery in just a few hours. Always buy an automatic charger so you will never overcharge your battery.