This is the post you should all read.
Check which technology type you're spending your money on, those early Deben packs, and it seems most of the others use packs of small cells joined to get the voltage / capacity, with packs of cells, unless they are all matched (and it's unlikely that they'd bother just to "run a torch") then there will be vaiations between each cell, which will give potentially poor performance and life, if 1 cell breaks down then the pack is US.
These battery packs are definitely a case of buy cheap pay twice.
For info, the wild hunters use a standard size c