In article ,
"Doctor Drivel" writes:

The battery test is, charge until it is 12.2 volts. Disconnect the ign coil,
so engine does not start. Turn over the engine for 15 seconds. If the
battery dies, then it fails the test.

Make sure you've got several hundred quid spare for a new cat at the next MOT.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]