BARGAIN...Apple Iphone 3g...Was on Tesco/02...but Unlocked...BARGAIN ?

I have an iPhone 3g for sale....phone works perfect untill it is taken off charge, then it shuts down after a few minutes...I suspect it requires a new battery (£25.00 fitted) ..but i have my 5 now so not gonna bother getting one..so here it is.....I have the phone and the charger ( the screen has a protector on it, so no dings dents or scratches) ..nothing else....BARGAIN @ £40.00...Phone or txt pref to 07999335639......Buyer to collect so they see its working....Im selling this phone as spares or repair ONLY....Cant be bad iPhone for £65.00 if new battery fitted