Final proof...

[farmboy]

... that I should be ferried to and from racing in a minibus and spoken to v-e-r-y s-l-o-w-l-y. I dug my car out to show a friend today realised I'd left it switched on with the Lipos connected.

One dead pack.

Presumably the cut-off won't stop it draining if the radio is still on, slowly sucking the power out of it?