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Cases with a battery built in, to charge the phone on the go.
5000mAh battery case for Samsung Galaxy S25 Ultra, offering up to 100% extra charge with slim, protective design.
5000mAh battery case for Samsung Galaxy S25 Ultra, offering up to 100% extra charge with slim, protective design.
£32.99
Protective phone case with a built-in 7000mAh battery for extra charge on the go, for Samsung Galaxy S and A series phones.
Protective phone case with a built-in 7000mAh battery for extra charge on the go, for Samsung Galaxy S and A series phones.
£32.99
Protective case with a built-in 10000mAh power bank for Samsung Galaxy A-series phones, giving extra charge on the go.
Protective case with a built-in 10000mAh power bank for Samsung Galaxy A-series phones, giving extra charge on the go.
£35.99
A 7000mAh battery case that charges your iPhone 17 series phone while protecting its corners and sides.
A 7000mAh battery case that charges your iPhone 17 series phone while protecting its corners and sides.
£36.99
A battery case is a phone case with a rechargeable battery built into the back. When the phone runs low, you press a button and the case charges it, with no cable to carry and nothing to plug in. It suits long days away from a socket: travel, festivals, work on the road, and phones whose own battery no longer lasts the day. The trade-off is weight and thickness, because the battery has to go somewhere. Some people keep a battery case for long days and a slimmer case for the rest of the week.
The battery cases here today are made for particular phones, such as the iPhone 17 range and Samsung's Galaxy A phones, and each lists the models it fits. They have a power button to start and stop charging, and some have lights showing how much charge the case has left. On some, the case charges the phone first and then fills itself when the phone is full, so one cable at night charges both. The capacity, in mAh, is in each product's name. Choose your exact phone from the list on the product page, because a battery case is shaped and wired for one model.
The mAh on the box is measured at the battery's cells. Some energy is lost raising the voltage to charge a phone, and as heat, so roughly two-thirds of the mAh ends up in the phone's battery. A case rated well above your phone's own battery will give it a good extra charge, but rarely two full ones. To check, compare the case's mAh with your phone's own battery, which the phone maker lists on its specification page. The guide to power banks explains the sum.
Usually not. Apple names battery cases among the cases that can stop or slow wireless charging, and suggests taking the case off. Charge through the case's own cable instead.
The UK Civil Aviation Authority says power banks must travel in the cabin with you, never in checked luggage. A battery case holds the same kind of lithium battery, so keep it in your hand luggage and check your airline's own rules before you fly.
If you only need extra charge now and then, a slim power bank or a magnetic power bank keeps the phone light the rest of the time. If you need it every day, a battery case is always there.