Pro tip, order a CR2450 battery holder with 20mm pin spacing and solder that in instead. Costs $1. Then use a normal CR2450 button battery, they are cheaper and can be replaced easily next time.
My model was slightly different JBA-T10A.
After removing the 4 base screws I had to lever the base off with a flat screw driver.
No need to disconnect the power wires, the power socket slides out from the plastic base.
3 screws hold the circuit board.
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