Burlen battery pack

[yellow B31]

I find in my recently acquired B31 hidden in the battery case, a Burlen sealed battery, it actually looks like 3 round battery's in a molded case. Can this type of battery be revived as the bike has been unused for a number of years?

[Oily bloke]

It is a Cyclon sealed battery. I use them on all my brit bikes. They last for years but if left to go fully flat they can be difficult to successfully revive. I use a modern electronic "charges everything" contraption which seems to work most times but 5 years has probably done for yours.

[yellow B31]

Thanks Oily. Looking at the paperwork that came with the bike its been stood 11 years so doesn't sound too promising!