Battery Vehicle Society

Thanks to both of the above for the suggestions, I will certainly check them out.
The lousy weather prevents at present, but I'll get me wee multimeter out shortly.
Thanks for the offer, but I'm in Belfast, so prob not practicable!
Post later.

Update on my charging problem. I grudgingly bought 2 new 80aH batteries, but the damn charger STILL occasionally flashes and ticks. Other times it behaves impeccably. Any other ideas, or do I now need to think about changing the charger too? (This was Invacare's suggestion, but it sounded a bit half...

Thanks Anthony, must admit.I haven't even looked at them yet!

I have an Invacare "Comet", second hand,which I've had for about 6 months. I use it's own charger, successfully until vey lately. Occasionally, all lights on the charger will flash off and on, at about 1 second intervals, accompanied by what sounds like a solenoid click from within. Someti...