Agm question

[JimC]

Have a northstar 31 group agm ,purchased late 2016. Last 2 times out the battery quickly drops to 10 ish volts and won't power livewells and the 1 graph i have on this battery. However the battery has no problem starting my mercury 250. I checked battery when i got home yesterday, yup 10.6 volts on meter. Is it possible for this battery to lose it reserve power and maintain its cranking ability? Is 3 1/2 years typical life span for this battery? Battery is always on my minnkota charger any input greatly appreciated!

[bobcoy]

Sounds like it is running down. What is the rested voltage after charging?(24 hours with no charge and no load) Should be around 12.8. Bob

[CatFan]

It sounds like a shorted cell. Not common in AGMs, but not impossible. Do the test Bob suggested.

[JimC]

Will do gonna charge till charger indicates trickle than i will try what you guys suggest. What type of life span are you giys seeing that have this type of battery

[bobcoy]

I have had agms for 10 years. 3 sets of AGMs. I troll pulling cranks for 6 to 8 hours at a time most days. I need batteries that last the day, 3 to 3.5 years is about it for my use. They were not top of the line( Cabelas Advanced,not pure lead). Bob

[XingEyeballs]

You might want to check warranty, pretty sure the Northstar is 3-4years if it is bad.

[Blake]

4 years for that North star

[JimC]

charged battery up charger putting out 13volts battery reached trickle mode pulled plug read 12.8 on volt meter. No further charging for 4 days checked battery 12.volts. Went to ramp checked battery 12.8 v motor started right up turned on accesories power the 1 finder i have on this battery read 10.8v and livewells would not work. Check starting battery 12.8v Not a tourney day so fish all day got home starting battery 12.8 volts. ?Checked power to acc panel 12v in 10.8 out! Nitro 2016Z21 digital keypad style system must be bad. I feel battery is fine. Thanks for the advice guys!

[bobcoy]

If I understand, you now get 12.8 on the battery and 10.8 at your boats panel. I would look for a bad or corroded connector from the battery to the panel before replacing the panel. Bob

[JimC]

the connector to the panel is reading 12v the power block after the panel is sitting at 10.8v

[H-D Dad]

If your reading 12.8v at battery and 10.8v at the graph, you probably have bad connections or corrosion in your wiring. I would start by pulling the fuses to check for anything out of the norm. Good luck.

[JimC]

Thanks H D i tried that disconnected the fuse panel 12 in 10 out of the switch with no loads attached

[bobcoy]

If there were no load attached it should have read the same on both sides,even with bad connections. Does it have push on connections? A new panel might fix it and is a good option if you can find a panel. If not either bypass that panel or clean all the connections. Bob

[JimC]

Plug and play switch panel it should be covered in my warranty