Zip charging - getting my head around using a dedicated battery for this... - RC Groups
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Apr 19, 2009, 04:57 AM
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Zip charging - getting my head around using a dedicated battery for this...


Just a question about Zip Charging - I have already built a Dan's Charge Cut-off circuit, and plan to put about 2000mA back into the 3s batteries.

If I get an 18Ah 12V SLA battery, how many times can I charge the 3s packs before I get to a safe low voltage with the SLA that I have to stop?

A guess would be 8 - because I take the 18/2 which gives 9, and leave another 2A as a safety buffer for the SLA.

Am I thinking this out right? OR would I get more? Or less?

I've heard of people using their car batteries, I've only got a small car and worried that I will charge till I can't start. (but maybe with a few A123 packs I could start the car LOL)

I'm probably going to build a 12v safety cutout circuit if I use a large SLA battery and can get a decent amount of charges out of it. That way I can run the battery down to a pre-set limit. But is it worth investing in an 18A 12V SLA battery to take to the field or will this only give me less than 10 charges?
Last edited by deswong; Apr 19, 2009 at 09:50 PM.
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Apr 19, 2009, 08:43 PM
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This is cross-posted to the Batteries and Chargers forum.
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