Is a sexual Batman.
AO Silver Member
Join Date: Jul 2008
Location: United Kingdom
Re: Never charge your battery while it's connected to the car.
You have to disconect the battery from the car when charging its just commen practice, with new sealed batterys they come with a vent tube to release the gases caused by charging, if its a old style with vent plugs then these must be unscrewed and removed while chraging to allow the gases to vent. Jump starting yes leave the battery connected but put the negative terminal the the vehicals earth which stops sparking and over current to the circuit which can put stressful amounts of current down your wiring loom, causing the electrical problems many talk about.
Unless your battery is so flat it wont jump start, then i would recomend jump starting and leave the alternator to trickle charge the battery, go for a little drive, as the alternator charges the battery no matter how fast the engine runs, unlike the old style dynamo systems which where usesless and very heavy, and only charged at speed.
There are many types of charging, most commen is tricle charging which charges the battery over a period of time with the same current, usually over a period of 10 hours. Boost charging is used to get the battery charged very quickly by putting a high current through it would def not recomend this type of charging while still connected to the car. Pulse charging is used as a last resort when the battery is dead and the sulper has settled onto the plates, it sends pulses of current into the battery slowly breaking the sulper of the plates inside the battery and hopefully getting it to work again.