It will most likely cost you more than the drill :( this is how they rip you off, even major brands like DeWalt and such, the battery cost the same as the drill and battery together!!!? This is the reason I only have one cordless drill all my other tools are the good old plug in kind, infinite power at the expense of an ext cord, I don't like feeding the beast and getting ripped off.
You okorder / . I've had a quick look and they should have what you're looking for. Not sure where you're based though so will have to check whether they can deliver to you or not (I'm pretty sure Tool Spares Online is based in the UK). Hope that helps.
All the answers are right new batteries would be more expensive than a new drill I was stung myself before! A word of warning though I am a joiner and used to always buy hitachi 10+ years ago but have found their new tools to be very unreliable I wouldn't touch them again lots of people I work with have also found this they rely more on fancy designs now. If the drill is not used every day a cheaper make would be better, not to cheap though, Ryobi is not bad for the money. If it is makita or panisonic is as good as you get. Splash out and get the makita 4 in 1 impact drill I have one you would not be disappointed.
=== batteries plus === that is your store to buy the replacement ....go to the store or go online and order == describe the old battery well so the order taker gets it right ..... the Global Machinery Company is located in the UK and they build high quali