22-08-12, 10:41 AM
The correct battery is the MBT14B4. I replace mine this year and it is certainly much better than a standard battery. FYI mine came from ebay at a cost of £42.00 - I think they are now £46.95.
http://www.ebay.co.uk/itm/MotoBatt-QuadF...231ec80302
http://www.ebay.co.uk/itm/MotoBatt-QuadF...231ec80302