Have had bad run down power on 4g... Like gets into red at 20 % and then visibally dropping by the second.

What could be doing this?

New ( supposedly) battery end February, now on 86 % health .

Was one of the "cheap" replacements (25 quid )

This doesn't encourage much

https://www.google.co.uk/amp/s/amp.r...ampf=undefined

Go into mobile data setting and switch off mobile data for the apps that you have no need for it. That’ll narrow it down.

As for the battery, Pays your money takes your choice.

Just had mine replaced for €40 by a repair shop in Carrefore, couldn’t get it done by Apple as the screen has a tiny crack in the corner as I’m not in the mood to fork out for another screen I’m likely to smash again (never had this issue with the 4s and 5).

Two weeks in its still on 100%, but I guess time will tell.

yes but as above if the screen is cracked you need to repair that first

At today’s exchange rate £5 more.

But it works out a lot cheaper because he did it without causing further damage to the screen, and seeing the nearest Apple store for me in the UK is Solihull or Birmingham, I can easily add £20 on top of that for the fuel and parking costs! Also it took 20mins from being served to collecting and paying, last time I went to an Apple store I waited that long just to be served despite booking an appointment!

And of course, as mentioned they will want to replace the screen!

In hindsight I should have had a new battery the last time the screen was replaced, but they weren’t doing the discount at that time.

I’d probably finish off the screen if I tried it myself

The battery on my iPhone was decreasing rapidly, thought it was knackered so I took it into the local phone repairs. Turns out the battery was ok and the problem was a faulty U2 chip inside. I said what would cause that to happen and the guy said either cheap charger cables or I’m letting it over charge, damaging the microchip inside. Anyway, 6 months later and it’s been absolutely fine.

Still in 100% on mine.

So yeah, either a knock-off or faulty battery or it wasn’t replaced!

Charged using a genuine charger or a Pioneer AVIC car play radio....with Amazon basics cables.

I have for sure used Anker cables off laptop regularly and anker branded 12v in car every so often

Other than that it's been the Apple one originally provided !