SLA battery Monitoring and Auto Recharge circuit

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I’m interested in Red Wines SLA battery Monitoring and Auto Recharge circuit & can’t seem to find a similar circuit. I’ve also seen a similar circuit used by Audiomagus PowerCenter and the KingRex SLAP!.

I have a 12 volt 5 Amp Hour rechargeable SLA battery and a 12 Volt 4 Amp Three Stage Charger. My problem is that I want a circuit board that will auto recharge when the amplifier isn’t playing and switch off when the amplifier is on. So the charger is always plugged in. Does anyone know where I can get such a circuit?

An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


Thanks
 
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