How do you mean stiff ? The key, the latch or the physical movement ?Anyone else having trouble taking the battery out?
Mine gets really stiff and really difficult to take out, any ideas how to help this?
I normally just turn the key anti-clockwise, then when on the none drive side use the forefinger/index finger to rotte the release catch then pull the battery down with my thumb.
It's generally pretty easy to drop down and then pull out.
Could be your mounts need adjusting if you can't identify anywhere else it's catching ?