I've tested lots. There is a vast range of prices & capabilities. Older, cheaper, models will recharge phones but very slowly.
Newer models using USB C ports and "PD" charging protocol should list their maximum power output (often 45Watt, 65Watt or 100Watt). Stupidly, power banks list their capacity in mAh (milli Amp hours) which is a measure of current, not power . It assumes 3.7V which is wildly out of date with PD charging protocol which run up to 20V.
A 45W PD power bank can fast charge a phone. A 65W PD power bank can run most laptops & tablets. A 100W PD device can run super fast charging like SuperVooc.
What devices you want to run & for how long determine the best fit. There are some caveats. 100Wh (30,000mAh) is the largest you can take on a plane in hand luggage for example.
If you let me know what you want to do with it, I'd be happy to make suggestions & maybe send discount codes
Got itI'm listening to alot of audio books whilst building back upto time on my feet - ie walking whilst keeping entertained - I want to do some l-o-n-g walks so need to build some hill time up.
So I need a bank that can recharge my smart phone for maybe a longweek end of constant use.
Many thanks
Its a Moto G75Got it
What type of smart phone?
Pack carry or pocket carry?
Right. Your phone has a 5,000mAh battery and can accept 30W charging. If you are using it near constantly over a long weekend let's say one and a half charges per day so 7,500mAh per day. For 4 days you would want a 30,000 mAh power bank. This is the upper end of power bank sizes. If we say one recharge a day, a 20,000mAh power bank will work. These are cheaper.Its a Moto G75
The phone tends to sits in the top pocket of my bergen - then Blue toothed to the head phones - so its capable of being charged whilst playing.
The bluetooth head phones also need charging so that adds to the overall loading.
uk.aferiy.com
Right. Your phone has a 5,000mAh battery and can accept 30W charging. If you are using it near constantly over a long weekend let's say one and a half charges per day so 7,500mAh per day. For 4 days you would want a 30,000 mAh power bank. This is the upper end of power bank sizes. If we say one recharge a day, a 20,000mAh power bank will work. These are cheaper.
I like the INIU at the budget end & keeps you under £30
Anker Zolo Power Bank (2025 Upgraded Version), 45W Max Fast Charging, 20,000mAh Battery Pack, Dual Built-in USB-C Cables, USB-C&A Port, for iPhone 17/16 Series, Galaxy, MacBook, and More : Amazon.co.uk: Electronics & Photo
Free delivery and returns on eligible orders. Buy Anker Zolo Power Bank (2025 Upgraded Version), 45W Max Fast Charging, 20,000mAh Battery Pack, Dual Built-in USB-C Cables, USB-C&A Port, for iPhone 17/16 Series, Galaxy, MacBook, and More at Amazon UK.amzn.to
Anker 20,000mAh (bigger brand)
Anker Zolo Power Bank (2025 Upgraded Version), 45W Max Fast Charging, 20,000mAh Battery Pack, Dual Built-in USB-C Cables, USB-C&A Port, for iPhone 17/16 Series, Galaxy, MacBook, and More : Amazon.co.uk: Electronics & Photo
Free delivery and returns on eligible orders. Buy Anker Zolo Power Bank (2025 Upgraded Version), 45W Max Fast Charging, 20,000mAh Battery Pack, Dual Built-in USB-C Cables, USB-C&A Port, for iPhone 17/16 Series, Galaxy, MacBook, and More at Amazon UK.amzn.to
Once you step up to 30,000mAh, buy decent. I like AFERIY. You can use discount code ENGLISHCOUNTRYL on anything on their website, but apply any vouchers they offer first. They won't let you combine them so check out best deals
I like the AFERIY Nano in this space. It's too large for pocker carry but can give 100W for laptop, phone, tablet ir even router in a power cut
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AFERIY Nano100 99.2Wh/31000mAh Portable Power Station | 100W Output
AFERIY Nano100 100W 99.2Wh/31000mAh is ideal for off-grid living & home emergencies. ✓ 100W, 99.2Wh/31000mAh capacity ✓ 1.09kg weight ✓ 7-year warranty ✓ Free shippinguk.aferiy.com
Hope that helps

Not exactly a battery bank.. but i have an Olight latern thing... Basically this but maybe an earlier model as mine cant be controlled with your phone. But it can charge my Iphone 4 times over. It's also a lantern lol. On low, it will last a week (without charging other stuff) I use it as my bedside light, had it couple of years. Cant fault it at all.I'm guessing battery banks have come on - I'm talking smaller ones to recharge Mobiles up a few times
Can anyone suggest a decent one please. Thanks