With the unlikely but still possible news that we might have to face a few power blackouts in the middle of this coming winter if energy sources are a bit low, I personally think it makes sense to invest in one of these ‘power banks’.
Essentially it’s a big storage battery that can be filled up at any time, and then will power/charge a number of your electronics (phone being the main one for emergencies). They’re really useful things to have in general anyways for days out/keep in the car and the like.
Lidl currently has this 10,000mAh (in other words really high capacity), Quick charge, and Includes USB A to USB C Cable for £17.99. Unusually, it also comes with a 3-year guarantee which I think makes it a great buy if you can find one ‘In the middle of Lidl’.