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This review is from: Backup Battery Charger Extender with Micro USB for HTC HD7 7 Mozart Desire HD Z Wildfire Trophy HD Mini Legend HD2 (Electronics)Excellent product, does exactly what it's supposed to. Have only done two charges so far with freshly charged batteries each time but it's very reassuring to know that I have it. Using GPS etc. on a smartphone really eats the phone battery so it's definitely worth having this as a back-up. Also delivery was very quick even on standard.