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looking at the picture above repair mode is 1.5 amps....get it on the charge mode of 7.2 amps and see if that brings it up...1.5 amps is just a float charge.

I have one and it works great! I have the 803 though....one thing I found was to unplug it before you start the genset...on mine it won't make power if I do...no idea why. Other than that it works great keeping the batteries up to snuff.

so it has a 5 amp charge or 7.2 amp agm or lithium....I can see how this charger could be kinda confusing since a 1.5 amp repair is more like a float charge...I guess they got something in these that makes that low of a charge do something.

I'd ditch the noco for this and get a regular charger that puts out more amps to get a deep charge. 7.2 amps isn't really enough to do anything unless you leave it on for days. The settings on that charger are not designed to charge a dead battery.

ahhh so the 7200 is a fancy name for 7.2 amps...ok...that's not much at all. I'd charge for at least the 2 days at that low of an amp. I still have to get used to these chargers that don't let you charge dead batteries. I remove the board in my portable chargers so they'll output volts to...

That depends on the charger...if it's 12 volt or 24.

Knee jerk guess on the battery....possibly charging it overnight wasn't enough...not sure what a 7200 is as far as charge stye and amps...the noco 5x2 is really meant to top off and maintain and not charge up from a lower state of charge...I've also read that to get a red top to charge it needs...