I look for a trickle charge circuit operating from the vehicle electrical system, that would allow me to keep my jump starter battery continuously charged, but without the risk of overcharging.
A Schottky diode, to prevent back-charging, in series with a small value resistor, to limit the charging current, should work for that purpose.he battery is Lead-Acid, gel type, like those used in UPS, but larger capacity (18AH).
A Schottky diode has a slightly lower voltage drop, so allows the jumper battery to be charged closer to the main battery voltage.I have already connected a common diode (not Schottky) to avoid loss of jump starter charge in cases of main battery failure. Would that be OK? What if I connect the jump starter via a cigarette lighter plug (outlet is available in the trunk)?
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