17-05-2022, 07:39 PM
I've had a lot of success with a Sonnenschein GF 12 25 AG battery, Ruairidh. 12 volt gel battery from a golf cart or a mobility scooter. 28Ah cranking which isn't that much but fine for a 6v starter. The one in my Trials Chummy I fitted in 2007. Never charged it up. Never even took it out of the car. When I sold the car in January this year it was still performing as well as it did in 2007. It's length is a nats longer than you quote but others have got them into a Chummy battery box without a problem. Got one in the Ulster as well. Fitted in 2013 and still doing its job without recharging or any other attention.
Steve
Steve