Long story short, my evo has sat for about 6 months. It's been on stands getting slight stuff done it it(wheels/rotors/brakes) and for some reason, it wontnstart anymore. I go in today to try and start it, and I put the key in, all seems normal, then when I go to crank it it makes a sound then dies, no more battery. I plug in the battery jumper, and when I try and crank it all it does it keep clicking,aem boost gauge reads ER5

 

Replace the battery.

 

It finally started with the jumper box connected. I'm letting it slow charge overnight.