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You don't, you use all new ones. No amount of circuitry will let you properly match a new to old battery system. For efficiency, you let the batteries simply do what they do, and if they're matched at the start, you're okay. If they're not, you're not okay, you can never fixed starting not okay =)
You don't, you use all new ones. No amount of circuitry will let you properly match a new to old battery system.
5 or 6 in Parallel? that is a LOT of current. You can weld with 1, what are you powering, I'm guessing a big inverter system?
I guess you are going to use them in your car?
To avoild another post, I assume that Yes. In that case, the car's alternator will be taking twice load.
Installing 2 or more batteries are very common in the car audio world, but except if you are going to use the audio system with the engine stopped for long time, it's more a problem than a solution, again, due to alternator overloading.
If the headlights go dim with strong bass, get a capacitor or upgrade the alternator.
Yeah cause 1500 watts is small, even though you can cook a whole chicken with it =)
Buy a generator. They not that expensive and are going to be a whole lot cheaper than trying to hack something out on your own which will result in either death, burning something down, or frying a once loved tool =)