Battery iPhone 5s

often very quick battery discharged. 98% then used for a few minutes with 2 text, then a 10 minute phone call reduced battery to 77%. 5 minutes later i wanted to take a photo & battler was at 67% & within seconds shut down completely. Started to charge iPhone on car charged and immediately showed 68% charged.

This happens all too often so I reduced App's using data. Apart from this issue with the battery the iPhone is in good working order. I understand that Apple have updated the software to preserve battery life in older iPhones, but by iPhone battery often drops from above 60% down to 20% or lower even though it's not been used or have App's running.

This also happened with my iPhone 4s, so bought a new 5s and now it's the same issue with battery power.

I'm retired and now can't afford £500 for a new iPhone so unless this issue is rectified I will look at other cheaper smartphones and that will be a shame as I like Apple and have an 4k iMAC and iPad (2019).