First, identify your iPod model and select the correct replacement battery. This battery is for the third generation iPods - these are the ones with the slimmer body and a docking bay connector on the bottom.
This battery is supplied with fully illustrated instructions and two special plastic tools used to aid the removal of the iPod cover. Replacing the battery will invalidate any warranty and is quite tricky and Maplin Electronics cannot accept any liability for damage caused during this process. If you are in any doubt please use Apple’s “Out of Warranty Battery Replacement” service (about 86 at time of going to press). This 850mAh battery has 35% higher capacity than the original battery so will give you longer playing times between charges.