Weight: 220g/pc

Features : 

* Cheap price and Good quality
* Provides 2  optional Charging Modes and Upgrade IC
* LED with  battery level display
* USB output function with supply power for mobile devises 
*  Capable of charging 2 batteries simultaneously 
*  Automatically identifies IMR ,Li-ion, LiFePo4,Ni-MH and Ni-Cd ,C  rechargeable batteries  
*  Automatically stops charging when complete 
*  Features reverse polarity protection 
*  Power saving mode 
*  Built-in reverse polarity protection 
*  Designed for optimal heat dissipation

They will have  overcharge protection and short circuit protection.
To determine how fast the  charger will be look at how many amps it pushes when the charger is charging  batteries.

Most chargers  will be anywhere from 0.5 amps to 1.0 amps. The higher the amps the faster it  will charge.