Battery Charger Aa - 27'477 items found


New8 Rechargeable NiMH Battery & AAA AA USB Charger
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NewOriginal Ac Adapter For HP ED495AA#ABA NW199AA#ABA CQ60 Battery Charger Cord 90W
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NewGenuine For HP Compaq Ac Adapter 391172-001 ED494AA Battery Charger Cord 65W OEM
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New12x AA 3000mAH 1.2V NiMH Rechargeable Battery YELLOW
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New1pcs 6V 4SR44 PX28A A544 4LR44 K28A V34PX 8LR44 Battery
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NewNEW NABC AA Nickel-Cadmium General Purpose Battery
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New4 AA 3000mAh 1.2 V Ni-MH rechargeable battery BTY cell
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New8pcs AA +AAA NiMH Rechargeable Battery + Case + Charger
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New8pcs AA +AAA NiMH Rechargeable Battery +Storage Case
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NewWholesale!TADIRAN TL-4903 AA 3.6V 2400mAh 14500 Lithium Battery 4pcs Genuine New
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$9.99
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Rechargerable Battery Charger for PSP & NDS (No.1120030018)

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Can I Charge 2 AA batteries with my battery charger (with a car adapter) connected to a 12v 2AH battery?

Jul 16, 2008 by joemomentum | Posted in Car Audio

If I fasten my AA battery charger (with car adapter) holding two drained 2600mah AA batteries to a fully charged 12v 2AH Sealed Lead Acid (SLA) battery, will it explicitly charge them? Do I need a bigger SLA? 7AH perhaps? Is there some formula? Where can I find these formulas?

2 Amp-hr means you can disburden at a rate of 2 amps for a maximum of 1 hour. Or 1 amp for 2 hours, or 1/2 amp for 4 hours.

Now your 2600mah are 2.6 amp-hrs each, so you demand 5.2 amp-hours to charge them. Which seems like more than the 2 amp-hrs your lead-acid battery has.

But amp-hrs are a strange unit, used only for batteries, for advertising reasons. The true to life unit should be watt hours, which is a unit of energy. You can get watt-hours by multiplying by the battery voltage.

So the misdirect acid battery holds 2 amp-hr x 12 = 24 watt-hrs.

The AA batteries of 2.6 amp-hrs are actually 2.6 x 1.2 = 3.1 watt-hrs

So now it looks better, 24 watt-hr battery to burden 2 - 3.1 watt-hr batteries (total 6.2 watt-hr).

And you would be fine, except for inefficiencies in the system. Specially in the charger, which may only be 50% proficient. The charge-discharge cycle of batteries is 80% at best.

So we actually have 24 x .5 x .8 = 9.6 watt-hrs. But still higher than 6.2, but not by a lot. Noted the uncertainties like efficiencies, I'd try it first.

billrussell42 | Jul 16, 2008

>> 2AH

That is big-hearted of small for 12V. But given you are going from 12V to 3 volts (1.5 x 2), you should be able to charge them fully.
===
2AH means that it can acquire 2 amps for 1 hour to drain the battery. Given you have 12v, you will NOT be draining the full 2 amp.

Volt x Current = Volt x current (with 100% effectiveness).


Good Luck..
Lover not a Fighter | Jul 16, 2008

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