I have been noticing that my iPhone 7 (2017) battery daily life has dropped from approx 1½ days between charges down to ¾ to 1 day. On checking my Battery health it says my Battery maximum capacity is at 80% and I should consider getting a replacement Battery.
The phone otherwise is in perfect nick and we do not plan on updating just yet.
On doing a phone around of six dealers in Tauranga, I noticed that replacement new batteries range from $55 to $150, with repair time between 30 minutes and 4 hours.
I then had an interesting chat to Apple on line, they quoted $85 via their Authorised Apple Dealer in Tauranga. Now that very same dealer had just quoted me $129 and it would take 3-4 hours due to all the pre & post replacement testing processes.
Of course the cheapest places I am very suspicious of the quality of the battery (non authorised/approved) whilst the most expensive is just a rip off.
Apples iPhone Battery and Power Repair website NZ
My partners iPhone 7 is down to 83% so I reckon by the end of the year we will be up for replacement batteries and we will go through the Apple ordering and replacement service.