The title says it all. Basically just confirming that the cells are just "friction fit" and require a safety torx size 10 bit to remove the screws to open the casing. If it's an old battery then it will be more difficult to remove than a new battery.

I was able to take the innards of a 5ah battery that had a damaged case and put it into an old 4ah case. Fit perfectly, just wrote "5" on the side so I would know what it was. Maybe someone else could confirm that 3ah batteries (I don't have any 3s) have the same dimensions inside as well.

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