Hi,

I have a 1999 Jaguar S-Type, with a 4.0 Litre V8.

Recently I've been having battery trouble (I believe) - After being in town
the car would not start.  The engine would turn over weakly then the car
alarm would go off.  After having the car removed by a towing company to the
garage, they charged the battery and all was OK again.

For a couple of days anyway; then it happened again - but was at home this
time.  1 hour at 11amps and it fired back into life (battery came to charge
quite quickly)

This morning it refused to start again.  Been charging it for a total of 9
hours today (11 amp charger, but it tapers off) - the interior car lights
are brighter anyway and the charger seems to think it's nearly there...  but
still no go!!

Could it be anything else?  It sounded like it was almost there, but it
never started.  Further attempts gave the alarm going off and weaker starter
symptons along with the dials all going up and then back down?

It's got petrol in it, although not that much (reserve zone, but least a
couple of litres in the tank)

Also; what could be causing the battery to go overnight?  Is it shot?
Battery is old (Original) 90Ah model.