[Seeker]

Looks like my battery is throwing in the towel, too. Almost 6 years, 32,000 miles, permanently connected to Oxford 3X optimiser over winter.

Went for a ride 3 days ago and noticed that optimiser's "maintaining" was flashing whereas it should be on solid. Bike started ok, maybe turned over a bit slower but no problems during 30 mile run. On return, the maintaining light flashed for an hour then went solid (it would normally go through this stage in a couple of minutes) and optimiser declared battery was "strong".
Still ok yesterday but today flashing again (we had a colder night).
I've just ordered a new battery.