I had exactly the same experience when I took the bike for MOT last week. Tested the battery as I hit the starter and the voltage dropped immediately from 12.5v to 7.3v, but started easily on jump cables from my car.
Exide AGM 12-18 (250CCA) from Tanya arrived in 2 days and it fired up perfectly yesterday for a 180mile ride around North Lancs/Lakes.
Exide AGM 12-18 (250CCA) from Tanya arrived in 2 days and it fired up perfectly yesterday for a 180mile ride around North Lancs/Lakes.
I had to replace my battery today after 5 faithful years.
I hadn't used the bike since Nov last year (shame I know) and took it out yesterday. Started first time ok with a jump start for the car and rode for and hour. But it wouldn't hold a charge when I restarted it.
Ordered a Exide GEL12-19 Motorcycle Battery (replaced like for like) from Eurocarparts as a first time user (code: 5alxrw5) you get a 50% discount. £61.49 collected.
Good luck.
T