you just need a small electricians scredriver or the likes to split the casing apart. it's a while since i did mine, but if i remember correctly there are two or three, little tabs, one either side and one at the top perhaps that help retain the two halves together. if you break them when taking it apart it makes it difficult to seal it back up properly.
i bought two packs of tesco own brand rechargable AAA batteriesto make the battery pack up with. just take note of how they are held together and be handy with a soldering irion to make your new battry pack up.
sorry can't be more helpful or specific about things it was earlier this year that i did mine and i just went ahead regardless as it was a cheap one i bought from ebay to use as a spare if it could be repaired.
good luck anyway. Current: TDV8 (3.6) RRS HSE
Past: TDV8(4.4) Vogue
Discovery 3 Commercial
TDV8(3.6) Vogue
TD6 Vogue
D2 V8 ES
D1 V8 ES
RR Vogue Classic
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