'Performance Power' seems to be a B&Q own brand so I would suggest they are the only people to sell that brand, however I would bet they are made by a dedicated power tool manufacturer such as Bosch, Black & Decker, Makita etc so one of their batteries may work.
Failing that you could try ebay.
Adam
January 2010
thank you adam for responding performance power pro drill with nickel cadmium battery 14.4 v
Phil
January 2010
What make is it and what battery type (NiMh, Li-ion etc)
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix drills.