New Battery ??

That being said there seem to be decent litihum iron batteries, but it looks to be a mine field to find the right ones. They to go for the 40-50 quid mark, compared to the 120 lithium ion ones.

Get what you pay for I think.p

There a place on the industrial site in Merthyr (goat mill road) than makes and sells battery's mite be worth asking in there.

Supac, they are stockists of Yuasa(and other) batteries. reasonable price for them too.

dude have always found the trickel charger was never enough for my road bike in winter, so either ride a few hundred miles every few week's or bring the battery indoors and charge it normally, nothing else worked for me or is it just too cold here