Advice-using 1slightly used and 1 new battery in parallel

[ahalls]

I have a 12 volt MGxi5 TM that currently runs of one Interstate SM29 battery. The battery (Mf'd Aug 2015) came with the boat when i got it last year. it has always been maintained year round with an on-board charger. Reads 12.66 volts when i measure it off the charger. Am thinking of pairing it with a 2nd, new SM29 and hooking them in parallel for double the run time. Any issues with them both not being brand new - have read that that is a consideration in charging etc? Any other advice? Thanks!

 

[onthewater102]

FWIW I have a pair of batteries I use in parallel that were bought a few years apart so one is older than the other. I charge them in parallel with the charger connected to the + side of one battery and the - side of the other so they both have to charge together & haven't run into any issues yet, I've been doing that for 4 or 5 years now.

 

[VAbassin]

Hook them up in parallel and run em!

Sent from my VS990 using Tapatalk

 

[ahalls]

Thanks guys! Picked up the new battery today and will install this weekend hopefully!! Will look forward to maximizing my run time.

 

[New River Rat]

FWIW I have a pair of batteries I use in parallel that were bought a few years apart so one is older than the other. I charge them in parallel with the charger connected to the + side of one battery and the - side of the other so they both have to charge together & haven't run into any issues yet, I've been doing that for 4 or 5 years now.

What he said! Been doing this myself until the batteries are replaced closer now, maybe a years difference.