Hi, I'd like a battery charger that could also be used as a battery for testing the electrics and also swapping an old battery over whilst keeping the car powered as not to lose a radio code.

Anyone got any recommendations?

Jon

Those are there different jobs --- a battery booster pack will cover two of them but for charging the car battery you still need a dedicated charger.

Lidl or Aldi chargers are excellent low cost smart chargers that won't damage your battery.

OK thanks, will take a look.