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Other than affecting charging time, does the amperes of a battery Charger really matter for charging a low or dead battery

Tiny
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  • MEMBER
  • 2008 TOYOTA LANDCRUISER
  • 100,000 MILES
I've just bought a car and I need to buy a battery charger for maintenance and in case I leave the lights on overnight (it's happened before).

The existing battery is 750 CCA, and 100AH.

I'm aware that there are different qualities of chargers, and that a charger with more stages is strictly better. I'll be getting a good one.

My question is, is a small charger capable of charging a big battery from near dead flat? For instance, could you charge this battery from near flat (but still above 3V) to full on a 4A or 6A charger?

From reading the literature from battery charger makers, they recommend a 10 - 12 amp charger for a battery like this, and don't recommend a smaller charger, but I suspect that's just part of their upselling. The speed of charge isn't important to me.
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Tuesday, December 3rd, 2019 AT 3:42 AM

1 Reply

Tiny
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  • 279 POSTS
Hello my name is Dave.

Actually the lower and slower you can charge the battery the better as lead acid batteries have what we refer to as memory, they will tend keep a proportionate pattern of charge/discharge you cycle them through so a slower charge usually equals slower discharge this is why battery maintainers use such a low amp charge rate.
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Tuesday, December 3rd, 2019 AT 4:22 AM

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