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Rear Bank resting at 13 and 96% charged. Front battery...


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I have four group 31 AGM's in the rear ( coming out for LTO) and they're all showing 96% charged but my front AGM (group 65) is resting at 12.2 and showing 55% charged. WTF? You guys think my rear Bank is slowly killing the front battery? Bosch AGM. Pep boys brand. Everything coming out for LTO anyway. 

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check wiring is thick enough awg to handle the current and balance the batteries good. 

maybe charge up the battery manually with a battery charger seperately on its own to see if it keeps a charge and then put it back and see if it starts draining again or stays the same theres something weird going on there for sure

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30 minutes ago, realflow100 said:

check wiring is thick enough awg to handle the current and balance the batteries good. 

maybe charge up the battery manually with a battery charger seperately on its own to see if it keeps a charge and then put it back and see if it starts draining again or stays the same theres something weird going on there for sure

Everything wired with 2/0ga... Silver tinned certified basshead with a singer 320 alternator. I unhooked the rear bank and I'm charging my front battery. Not like it really matters I have two hundred amp hour of lithium now so... AGM is coming out!!

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Are the recorded voltages with front/rear batts connected or disconnected from eachother

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I would disconnect your front battery from all wires, test voltage and if it persists at 12.2 then charge overnight and leave it on charge with a trickle charge or something. I use my xs power charger for mine but I’m pretty sure any will do if it’s in spec 

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2 hours ago, strangeduck said:

i dont think you are supose to mix lith wih agm. 

Doing a battery delete.

 

2 hours ago, SnowDrifter said:

Are the recorded voltages with front/rear batts connected or disconnected from eachother

Disconnected. I removed the rear bank. All 4 of my group 31's read 13v and 96% charged. 

 

2 hours ago, Joshdashef said:

I would disconnect your front battery from all wires, test voltage and if it persists at 12.2 then charge overnight and leave it on charge with a trickle charge or something. I use my xs power charger for mine but I’m pretty sure any will do if it’s in spec 

Took about 4 hours to charge to full. Need the front battery to be good until I get my LTO buss bars. We'll see what happens. 

 

1 hour ago, realflow100 said:

Not good idea to mix lithium and AGM. different operating voltages and charge methods and currents.

I'm aware. Thank you tho. 

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