Sennheiser system for hearing difficulties (Molesey KT8)

Sennheiser Set 810 infrared wireless listening system, including TI 810 base/transmitter and RI 810 receiver heads etc.
-designed to help people with hearing difficulties hear television, radio or other audio more clearly.

The base unit powers up and appears to be working. I have not been able to test the receiver headset because its rechargeable battery appears to be completely dead and will need new rechargeable battery.
It may therefore be useful to someone who can fit a replacement BA 151 rechargeable battery, or for spares/repair.
Free to collect from East Molesey.