Replacement Battery for CnM Minibook (Elonex OneT)

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The battery on a CnM Minibook (bought Maplin 15 months ago) now only lasts about 30 minutes.

Where can a replacement be obtained?
So far a web and eBay search has drawn a blank.

Is the pack also used on a different product e.g. portable DVD player which may open up a source?

Alternatively has anyone dismantled a pack and sourced the individual cells?

Any information will be appreciated.