Portable charger recommendations please!

[Lefthand]

Can anybody recommend a (tried and tested!) portable power bank for the HTC One and tablets in general? SAFE to use? Or ones to avoid, e.g. exploded or caught fire?

 

[Rukbat]

Phone and tablet chargers are commodities these days. Just about any one you can buy will give you the rated output current and is safe. (The difference in cost to the manufacturer between a good one and a piece of junk is about 2 cents, so there's no incentive to build "cheap" ones.)

 

[Lefthand]

Just to clarify, I meant a portable power pack, not just a wall charger