I use a battery Tender on mine during the winter when in storage. it keeps it topped off all the time so even if the shaker system is pulling a small bit it will keep it all good!

 

yeah my batt just craped out this weekend after 4 years and two deployments. it started with slow cranks to no cranks, but it had 12.5v i dont get that could someone explain that to me.it was all of the sudden, but i got me a new one and everything is fine now.

 

i had the exact problem

was showing a surface charge of 12.3 , but once you turn the ignition my batt nosedived to 8.9 volts

it wouldn't hold a charge anymore, even with a charger