GRATCH
HUGE MEMBER
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Hi Scoobie, with regard to batteries for starting diesel Disco's it's the CCA or MCA that counts much more than the amp/hr rating. This is because CCA is the rating which shows how much power the battery has - short term - to start the engine.
I used to have a TDi and I put in an Optima battery, only 50amp/hr rated but over 800CCA and that worked great even in the coldest weather - bit pricey though.
If you do a Google search for Tanya Batteries, they do a good battery at 1000 MCA (approx 850CCA) and 90amp/hr from memory, for about £70 delivered.
Good luck
Dave
Wot he said^^^^
I got one of these
Numax CXV-X 1000 Amp - Leisure Batteries - Numax Leisure Batteries
I would also clean all main earth cables and I added one from battery to engine.