2012 Forester open rear hatch w/dead battery?

[gbrand]

Searched but didn't see anything

 

2012 2.5 NA Forester-alt working fine, I have voltmeter on my dash. Sun am 400 mi from home battery stone dead no warnong, will not take a jump. My jumper cables and toolbox were ABOVE the rear cargo cover, but had some other tools and stuff below. Car had been locked, unlocked drivers door with key, and used unlock buttons on other doors to open. Read hatch would open one click but but all the way-so if my stuff was below I would have been up a creek. se a small panel on the inside of the hatch, not sure of a way to unlock-has anyone had to do?

 

Of course no key for back....

 

Buddy gave me ride to parts store and new battery worked like a champ

 

Thanks in advance