Hi, lately I've been planning to buy a power bank for my L520. But frankly I'm a bit confused with all the options available in the marketplace. What mAh should I keep an eye on? What else should I look for? Thanks.
Higher mAh = better. (but bigger typically)
So its just up to you. The 520's stock battery is I believe 1430 mAh, so a pack that's a little over that should get you a full charge approximately.
I'd also check out ZeroLemon's stuff, I think they offer some insanely big replacement for the actual battery you might be interested in.