Can i connect these?

[Carnivorous18 10+ year member]

I have my front battery at 12.99 volts and my rear at 12.6. Can i connect the two without problem? Or how close in volts do they need to be?

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[keep_hope_alive Premium Member]

they will equalize when you connect them. then the weaker one will drain the stronger one.

 

[Carnivorous18 10+ year member]

Lol thanks for respondin. Yea i thought about it before I connected it and im like alright I see it the same way as jumper cables work. If a battery is low and u jumper cable it to a higher voltage battery, itll just equalize it and it wont cause a dangerous high current. My worry was that one of my fuses would blow and I would have to end up gettin the back battery charged somewhere to match my front battery.

Another question though, is that always safe to do, if the batteries are the same brand, and the voltages are drastically different? I dont mean like a 12v battery and a 6V battery but like two 12V batteries with big dif voltages

 

[skittlesRgood 10+ year member]

well if a 12v battery is resting at 11v or something, its a bad battery and shouldnt be used. i would say, leave it on the charger over night and see what it sits at over the next day. its always a good idea to charge the batteries before putting them into the car.

 

[Carnivorous18 10+ year member]

Gotcha. But I mean maybe a battery restin at 12.5/.6 volts and another at 14.2+. Good info to know for the future