AuskangSlim Power Bank with Built-in Cable 2500mAh, [USB C version] The Most Lightweight Battery Bank and Thinnest Portable Phone Charger - Credit Card Size

This mini credit card sized powerbank seems really good. Small and very light it could easily fit into a pocket or handbag. I love the fact that the cable is inbuilt so there's no need to carry a separate one to charge your phone. It holds quite a lot of juice certainly enough to give my phone a good boost when out and about. It's a gorgeous pale blue colour too. I would recommend this product

I really like this as a handy pocket-sized charger. the built-in cable makes it even more practical and the charge indicator lights are helpful.

Wanted a very small battery pack to fit in a Maxpedition Micro pouch, which this does. It'll take a charge in an hour or two, and charge an iPhone one and a bit times, extending timeouts to days if travelling in remote areas (or like me you're simply forgetful of overnight plugins.) Team with an Incharge X adapter and a few male/female USBA/Cs, and you've got a charging solution for almost any small device. I recommend both this and its 5000mAh bigger brother which fits in the same small pouch although is a bit snugger.

Slim is great no is fast recharge

I love this. Nice and compact and easy to carry around for emergency power. Would definitely recommend.

I wanted something small enough to carry everywhere, and this fits in my pocket. It's a little bit too big to fit in my wallet, but I knew that when I bought it, it's good for one charge.

A very thin battery which could be easily carried in a pocket unfortunately it does not work. I will have to return.

I wanted a pocketable powerbank to top up my phone's aging battery that sometimes fails to get through a full day. This powerbank gives my phone a 50% top-up which is about 5 hours of HD video watching. More than enough for my needs.The metal build quality seems excellent. I am a little worried that the built-in USB C cable may be a weak point, but there is a separate USB C socket that can be used if it fails.It's a few millimetres larger than a credit card and easily fits in my wallet.Negatives: It is a little slow to charge from a 5V wall charger (about 3 hours from 0 to 100%). It also doesn't quick charge my phone. Neither of the above is an issue for me, as I will be using it on a bus, train or in a pub at the end of the day.Don't buy this if you want it to quickly fully charge a tablet or a phone. For me, it's the perfect powerbank to get a topup until I get home to recharge. Anything bigger and heavier is overkill.