Cheers lads.
The £40 battery one i had, lasted 2 years, so might as well just try and replace the battery.
As for main's items, What sort of current do i need,
i have seen
120amp max booster for £55,
200amp for £94
400 amp for £118
Not sure what one i need, but i do need it to jump mainly tuned cossie's and RST's. even with flat batterys.