7.2V/ 9.6V Battery Charger is perfectly compatible with SNAP-ON Battery Pack Fit Model: CTB5172 CTB5172B CTB5196 Multiple security protectionShort circuit protection, over current protection, over voltage protection, over temperature protection, over charge protection, over discharge protection, cycle protection. Charger use and maintenance:1. This product is suitable for SNAP-ON Battery Pack Model: CTB5172 CTB5172B CTB5196 batteries. Please pay attention to whether the charging interface and the charger connector match, the positive and negative poles must match. Dimensions: Battery Weight: 1.23 Ib Battery Size: 5.5 x 3 x 2.4 inches When charging, connect the battery first, and then connect the AC power supply; after fully charged, please cut off the AC power supply, and then pull out the battery plug. If you unplug the battery first when charging, especially when the charging current is large (the red light is on), it is easy to damage the charger. Battery Pack Charger 7.2 Volt/ 9.6 Volt Battery Charger Weight: 1.23 Ib Battery Charger Size: 5.5 x 3 x 2.4 inches Convienice installation and exceptional quality.