Maintain & extend the life of rechargeable 12 volt batteries.  When battery reaches 13 volts, charger will reduce output to maintain charge.  Other types of chargers provide a strong, rapid charge but tend to boil out liquids and decay electrodes.
 
Description:
Input: 100-240 vAC, 50-60 Hz
Output: 12 vDC, 1A
LED indicator: Red = charging. Green = Battery full
Feature:
Short circuit protection (LED goes out, charging stops)
Wrong connection protection (LED turns red, charging stops)
Battery is full (LED turns green, charging stops)
Charging time for YCG 9ah battery pack: 10 hours