Dead battery? Will only power up when connected to jumper cables but won't start up.

[96gstdsm]

Well my Eclipse has been sitting around for a good 5 months or so now. It has a new battery that I got right before it started to sit around. It had lots of gas left in it when parked. Put in new synthetic oil too.
I tried to start it up today and obviously got no power when went right to try and start it. Si I tried jumping it. I got power right away for the radio and everything inside but would not start. I could hear the starter going but no crank at all. It did not sound like it was trying to start what so ever. When I disconnected the jumper cables after been hooked up for about 15 minutes or so there was no power at all inside. No radio and the starter did not turn at all when trying to start the car.
Does this sound like a dead battery or maybe something else?
Been sitting for a really long time, so how long do these batteries usually have to be charged before they are able to start up? I didn't think when connected to jumper cables would need to take too long.

 

[19gale2gGST]

Check the fluid in your battery, low levels it wont hold a charge. Also take your alternator to your local parts store and have them check it(most places dont charge). Then make sure your starter is engaging. If the starter is spinning itself but not the flywheel/torque converter then it may be out of alignment or it may need to be rebuilt/replaced.

 

[turboboy4]

I would say trickle charge your battery over night then check that your starter is even engaging the gear onto the flywheel. Your starter might have taken a dump.

 

[96gstdsm]

Alright thanks guys. I will pick up a battery charger and try to charge it over night and see if it will hold the charge or not. If not my guess would be the starter as previously on two instances. The car would not start for some unknown reason. Pretty sure the starter was just messed up then, but never happened again after those two times so was strange.