2300 mAh rechargeable battery charge for several hours?
With 2300 milliamps divided by the current you charge (mA), that is, charging time (hours), such as charging is 500 mA, probably is more than 4 hours full. The general charge current is less than 500 milliamperes, the smaller the current the longer the charging time.
There are many factors that affect the actual, so the charging time is to specify the standard or the actual time shall prevail.
The output current of each type of charger is not the same, and the calculation of the charging time can not be so calculated, the theoretical charge time = battery capacity / (mobile power output current * 0.8) = 2300mh / (175mAh * 0.8 ) ≈ 16h