Smaller battery packs are great for refiling phones and tablets, but if you need to keep a laptop juiced up while you’re far from an outlet, you’ll need something larger. For this guide, we tested portable chargers with at least a 20,000mAh (74Wh) capacity, but kept the upper limit below 27,000mAh (99Wh), since that’s about the maximum size allowed by the TSA in carry-on luggage. Some laptop power banks sport extra features like wireless charging or an AC plug so you can power small devices such as a travel printer or an
→ Continue reading at Engadget
