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Old 24th February 2013, 06:50 AM   #11
MarianB is offline MarianB  Romania
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A well discharged LA battery draws verry high current when charging, the first step in charging it would have to be with a constant current source, limmited at about 10% of the battery capacity, the voltage should be at about 14-14,4V on the charging unit. That is why you need current limmiting, either with SMPS or 50/60Hz power transformer. There are loads of ways to go, you just have to be sure what you want for it.
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Old 24th February 2013, 09:20 PM   #12
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Using a voltage regulator (like with LM317) with current limiting (however it's implemented) acts as a constant current charger until the current demands drop as the battery charges, at which point it becomes a constant voltage charger.
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Old 27th February 2013, 04:38 AM   #13
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Thanks a lot for the ideas, that regulator circuit looks nice and simple.
I didnt realize the voltage regulator ICs had their own current limiting.
So it wont damage the IC to run it at its max amperege for extended periods of time?

1.5 amps charging current should be fine for the battery, I'm using a 7.2Ah SLA.
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Old 28th February 2013, 04:14 AM   #14
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It's fine for these ICs to run at the current limit, so long as they are heatsinked sufficiently. 1.5A is a little high for a 7.2Ah battery, what I've read is C/10, or 0.72A. But you might not hit 1.5A if it doesn't run down too far between charges. Even so, what is the cost of that SLA? If it's not expensive, I'd just go for it and see how it lasts.
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