Some time ago I bought this battery maintainer for use on a small 12V lead-acid battery. I found the battery had little charge after some winter months on the maintainer, but seemed fine on a cheap transformer-rectifier charger, and on the machine's own charging circuit. I measured the maintainer's open circuit voltage in the mid-12V range, which I consider too low for proper "maintenance." Accordingly, I decided to extract the circuit and see if I could change it appropriately. I have attached a schematic, assembly diagram, and functional description. This battery maintainer is well made and is a more sophisticated device than many I found online, and so worth understanding. I hope some find this interesting or useful.
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