Hi, I have a Jump starter for my car which get charged when required with it AC adaptor output on charger is 12v dc 500ma 8watt, problem is this charger is faulty (no output) was going to buy a replacement charger with interchangeable jack ends it has an output of 12v dc and up to 1300ma, is this OK to use as replacement charger for my jumpstarter ?will it charge the unit at the 500ma rate or at 1300ma rate how is this worked out.