k58.cross Posted September 4, 2019 Report Share Posted September 4, 2019 Adding a second battery is adding another tank of juice, and the load will be shared among the batteries. All you need to do is plug them into a charger once in awhile, because the alternator isn't going to keep both batteries charged while you're hammering on your system. But like Ky said, if the drop isn't that bad you don't really need to add anything. You might want to put your starter battery on a charger once in awhile though. Just watch your voltage and if you see drops below 12 definitely charge up. Link to comment Share on other sites More sharing options...
SnowDrifter Posted September 4, 2019 Report Share Posted September 4, 2019 I wouldn't sweat your current voltage, honestly. 12.7? You're fine. If you're itching to spend cash on an upgrade, 9 times out of ten, your best value and performance will be from an alt ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
Pelihagen Posted September 12, 2019 Report Share Posted September 12, 2019 I drop to 12.x at idle while revving the engine to about 2000-2500 RPM. Is this bad for the engine? I can stay over 13v while driving. Considering buying Lithium batteries in the future. Link to comment Share on other sites More sharing options...
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