Hi @Edward1

I could recommend you to switch of 4G signal and keep it on 3G, I could recommend to keep your brightness low, to remember to remove apps working in background but I don't the point in owning a smartphone is reducing its capabilities to perform in order to preserve battery life, therefore I have different suggestion here:

If you are running on newest iOS you can check your battery heath in the settings of your devices. It should be under Settings -> Battery -> Battery Health also you can check that using an app design for MacBooks if you own one called "Coconut Battery".

If your battery health will be lower than expected I could recommend you to pop in to your local Carphone Warehouse store and you could have it replaced for a price of £29.99 You can have look at this page here for more details.

Regards

Sometimes worth doing a self audit on the apps you don't use, we download so many and a lot of them will run in the background and start draining your battery or slowing your phone down.

Sometimes its worth backing up and starting again with a factory reset and see if that helps

Also look at your charging habit. Many of us are guilty of leaving our phones on charge overnight and its unnecessary and potentially damaging to cells in your battery

If you have any unused apps on your phone, delete them fully via your app store. My daughter has the same problem and when I deleted all her apps that she'd downloaded and then got rid of on her home screen but not the app store, it worked perfectly and her battery life is better. They still run regardless of if you use them or not

I had the same issue with my iPhone 6s. After putting up with it for ages, I took it to iSmash where they told me it needed a new board and battery which would cost £130 and it would need to be sent off for 2 weeks!! So I went to the Apple store and paid £25 for a new battery instead and now my phone works perfectly and the battery is as good as it was when I first bought the phone.

Go into your settings and audit performance across the piece. Also worth minimising usage at bedtime, put into power saving mode

Try to disable locations services and reduce the brightness as possible when you are indoor

Over time a battery will lose it's ability to hold a full charge due to how the li-ion batteries work. You can do what is said above (looking at apps that use battery, putting in power save mode, turn off bluetooth/location/wi-fi/4g when not using *though a good battery saving app should do this anyhow). I think the best thing would be for you to get a new battery for it - Hikari has given you useful information on how to do this above :)

Facebook messenger uses a lot, so does facebook, so if you don't need them, get rid of them.

I tend to use my phone extensively at home, but also when out and about. Battery life is greatly reduced if you have any of the following features turned on:-

Bluetooth (used to connect to my cars system to allow hands free phone in the car) if you forget to turn this off, when you exit the car, then the polling the system repeatedly does eats battery life. Turn it off once you exit the car.

I use WIFI when in the house for my phone. This saves data which I can then use when out and about. WIFI also polls repeatedly and will also eat battery life. Make sure you turn this off too when you are out and about.

However the biggest use of battery power is the screen and the processor. If you sit and play games, your battery life can almost be measured in minutes ..... I simply do not play games when out and about. I can get my battery to last 2-3 days easily, including making several calls.

I also have one particular app that eats battery power also. It is an off line satnav app. If I forget and leave this on when I exit the car, then this will eat battery life also.

I hope my experience provides some help. It is all obvious, but easily overlooked.

Not sure if it's applies to iPhone but I switch to battery saving mode on android which only uses certain apps and features which prolongs battery life, also recommend switching off WiFi and roaming to prolong life of battery when not using Internet. Hope this is some help

You must use low power mode most of the time and keep a low brightness that is below 25%. Do not use your phone consistently on heavy use, take a break and charge your phone. It would be better if you got a charger with more power such as an iPad charger.