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The motor brake is a solenoid clutch fitted to the end of the motor via a couple of screws, newer lifts now have an extra interlock switch fitted above the brake to prevent the lift operating whilst the manual winder is in position.
If you place your hand on the brake and put in a call you should feel a crisp click as the solenoid pulls in if its working. Never try to run the lift without the brake fitted please.The old batteries do sound shot, bulging is never a good sign and five years is getting to the better end of what would be expected for a working life.
NP7-12 are good, FR being fire retarded.The Pcb is a pain to access, swiveling the seat should give enough room hopefully, from memory there’s a single retaining screw at the top which holds the alloy heatsink in place (don’t drop the screw), the pcb and back plate can then be lifted slightly, you then needs the hand skills of a Gynecologist to disconnect the board, but you can at least see the relay on the pcb.