OK, this is a VERY specific deal, but in truth Digital Direct have LOADS of bargains at the moment at: http://www.digitaldirect.co.uk/clearance
This battery is for specific Sony camcorders (for example my Sony HVR-A1). It's the largest available size (up to 12 hours) and retails from Sony at £139.00 each at SONY and retail at around £90 in most places. I ordered two and the ones that arrived were actually the model up from the picture (with LED indicators on the spine) though there is no guarantee yours will be.
The dodgy copies sell on ebay for more than this (and my honest experience is that they rarely work).
Even if you're not interested in this product, check out the other sale items, some phenomenal deals to be had!