xRebirthed 1900mAh Microusb Battery Charger

I am on the road vibering my friend and suddenly my phone goes into "battery-saving" mode. I still have another outdoor event to go to and my "Creme Brulee is ready to be served'. And did I call my other friend regarding tonight's arrangement? Oh man I'm lost, why can't I use my phone's GPS? 

Seems familiar? 

Portable mobile chargers come to the rescue! They promise additional juice for your phone battery and brings you out of those sticky situations when your smartphone dies on you.

Or do they? This one from xRebirthed is a typical mini USB charger with 1900mAh, and a free anti-radiation sticker. The charging port fits well to my Galaxy GS2. On the first few charges and discharges, it charged my phone by 60%. It was about 3 months when the charger didn't charge as much (like <30%), and the charging port no longer fitted as well so it was loose. Charging my phone was almost impossible. 

I had to switch to another charger after that. $11.70 for less than 3 months of standby charger? I'm sure anyone can do the math.

Source: Gmarket 

Rating: 6.5/10

Price: $11.70 each + Free shipping