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A car battery is a very precise voltage regulator. Why would you waste money by buying another one?
If you connect a charger to a car battery, you must open the cells. This can result in some spitting of the acid, that's why it is always advised that a battery be removed from the car while being charged.
A word of warning. If you power your sound system off a battery and have a battery charger connected, make sure that you connect the sound system to the battery terminals and the charger, independently, to the battery terminals. If you connect the charger to the sound system and then connect this to the battery, there is a danger the battery would become disconnected leaving the sound system connected to the charger only. Depending on the charger design, this could put a higher voltage than is desirable on the sound system and may damage it.
Thanks for the answers, i'll try a battery charger. Why do you think it might cause a 100hz hum?
Quote from: Don_1 on 27/11/2009 11:47:21If you connect a charger to a car battery, you must open the cells. This can result in some spitting of the acid, that's why it is always advised that a battery be removed from the car while being charged.What! Do you always disconnect you battery when you are driving? The alternator is just a charger!I think you are correct if you are using a really fast charger that pumps out a lot of amps, but a little 5A charger can be left on without any problem. When the battery is fully charged, the current drops off to next to nothing.
It must be some serious bit of car audio kit if it's worth listening to from outside. Would it not be prudent to just bring a ghetto blaster into work ?
A better idea is to use a second battery to power the audio system only, and have a split charger connected to the alternator to charge both systems when the engine runs. This enables you to still start the car if the battery for the audio is flat. The split charg conversion is often done for the owners of caravans and for off roaders with big power winches. You can get it ( in the UK at least) from Maplin, and supply your own second 12V car battery of appropriate capacity.