I understand it uses a 3000mAhr one. Is there any way I can be sure the shop replaces it with one of that capacity? Just going to take it in to a mobile phone shop in Rotorua.
Check they are an official Sony service agent or you are going to get scammed, Don't let one of the dodgy mobile phone repair shops touch it
Make it clear you only want Genuine Sony parts installed in the phone
Are you wanting it waterproof etc afterwards? If so you'll need to send it into an official repairer. If you dont care its just as easy to replace the battery yourself - unless the battery has come via the sony channels then it'll most likely be an after market one. They are cheap on Aliexpress - you just need to know the model of your phone.
They will most likely have replace the glass on the back then do pressure tests including an immersion test. I have all the paperwork from when I had it done on mine here somewhere. Luckily mine was covered by the warranty or else it would have cost a large fortune - they claim to have used around $700 worth of parts to make it waterproof again after replacing the battery (front / back glass, buttons, speaker replacements etc).
Im going to replace the battery in my old one sometime soon. Battery swelled up again after 6 months use after having it (and the rest of the parts) replaced under warranty.
If you want it waterproof still a Sony official repairer is the only place that will be able to do that.
With that in mind is there any reason you want to keep using such an old handset with what it will cost?
PSLog:PS PCHut say new battery capacity is 3000mAhrs but not Sony brand.
They will tell you what you want to hear do not trust the clowns in these foreign owned mobile phone repair shops
Discharge a fully charged battery at a set rate and time it.. So realistically no. Theres no real way to tell if the battery is a good/bad/piece of crap. Your best bet is still try and source a real genuine battery. Thats the only sure fire way of guaranteeing it. And based on the fact Ive had 2 genuine sony batteries die in the same way I certainly wouldnt trust an after market one.