Have someone on your holiday list that’s difficult to shop for? I guarantee they’ll get use out of a good USB battery pack, because who doesn’t need extra battery power from time to time? Anker’s PowerCores are our readers’ favorites, and several models are on sale for Black Friday.

I’m partial to the PowerCore Fusion, because it has fold-out AC prongs, so you can plug it straight into the wall and use it as a regular wall charger.

If your giftee already has a big battery pack, it’s worth owning a pocket-sized model as well.

The PowerCore II 20000 features Anker’s newest technology, which ensures your phone will get the fastest possible charging speed.

And the classic PowerCore 10000 strikes a great balance between size (it can fit in a jacket pocket or small purse with ease) and capacity: About 2-3 full phone charges. The Speed model adds Quick Charge 3.0 for compatible phones for $9 more.

For the rest of the best Black Friday Anker deals, head over to this post.