Rigid_EVO Juice in Accessory but not Ignition

Over the last couple months I've noticed my '03 Custom hesitating a little when turning over but it always started. Last Sunday I went out to start it and it was stone dead. I put the battery on the charger for 5 days and just went out to check on it. When I turn the key to Accessory everything lights up but when I turn the key to Ignition all lights go out as though the battery isn't even connected.

I've never seen this before. Any ideas?

Thanks.