Speak to Russ, he's got umpteen RA's for spares and repairs!! And I see Dave (D13dkt) was selling a load of RA bits recently. May be worth giving him a shout.
(Liked your 1993 pics of Pant Glas. I note the step hasn't gotten any smaller since all those years have passed! ha ha)
Sorry Brian after finally managing to get hold of some new batteries and fitting them all six of mine are now working fine so no spare parts I'm afraid :)
Where did you get the batteries Russ and how difficult were they to fit?
Some say that it isn't always the batteries that have died and that a fault can occur on the mother board whereby it thinks the battery is charged well before it is and switches off the charging meaning you never get the full charge