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hi there,im cam, a licenced dignostic tech.connecting chargers to the battery are always optimal, but if it is a low amp trickle charger than you will be fine through the cigarette lighter.the 12v lighter plug must be a full time 12v outlet to be able to charge the battery directly.if it is a ignigiton on or a accessory plug that only activated when isgnition is in on or acc position than it will not charge the battery.
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