>> Will any old replacement battery do at a phone shop ( circa £20 I think)
Should be fine, obviously depending what battery they fit.
Had the battery in my previous iPhone SE changed at a high street shop that sells China's finest phone cases and other phone accessories.
I could have changed it myself, as it's the same procedure as the older iPhone 4 which I changed the battery, but couldn't be bothered when it wasn't much dearer paying someone else to do it for me.
IIRC, I paid something like £25 for a "genuine iPhone" battery. I think it was something like £15 for a non genuine one. The £25 one came with a 1 yr warranty.
I however have a feeling it wasn't a genuine battery that was fitted because the battery health monitor in the settings menu now says "Service" which is an indication an aftermarket battery has been fitted.
Phone was fine afterwards though.
You'll probably find that a lot of these shops fit 2nd hand "tested" batteries from damaged iPhones.
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