Try needlenose pliers
I had the exact same problem recently on my 310CE. I bought it used from a dealer and the first time I went to replace the AA batteries, the second one was jammed in there and I could not get it out. Amazingly, the battery had been wrapped up in a piece of paper very similar to a post it note and this was keeping the battery from slipping out.
After trying a few things, I eventually went to Home Depot and bought the smallest pair of needlenose pliers they had. I put the pliers up into the AA slot and grabbed the terminal head of the battery. Once I had a good hold on the battery, I pulled and it came right out.
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