Flat Battery

[Grahamm]

I've jump started bikes from the car many times without any problems.

If anyone is thinking of jump starting a fuel injected bike from a car *DO NOT* have the car engine running, otherwise you could fry the bike's electrics!

I have an Optimate charger which claims to be able to recover deep-discharged batteries, although I've never tried it.

Note, however, that if one (or more) of the cells has died, it will still register as fully charged, but you'll have less power to crank the engine. I found this out when a brand new battery failed very soon after fitting it.

The only way to check properly is to find a friendly local garage and get them to put a drop-tester on it.