Potek 2/10/20 Amp Speed Smart Battery Charger and Maintainer with 50-Amp Battery Clips;

A must have for your car! :
This automatic speed battery charger has a 20-amp fast charge self-adjustment feature which monitors battery condition and adjusts charge rate to prevent battery damage to your car, truck marine and farm equipment, gel cell, and deep-cycle batteries.

Specification:
• Rated input voltage: 120V AC/60Hz
• Input current: 4A
• Rated output voltage:12V DC
• Output current: 2/10/20 A
• Maximum output current: 20±2A
• Maximum Charging voltage:14.8±0.2V
• Floating charge voltage:13.6±0.2V
• Dimension(L*W*H):10.1*8.3*5.6in
• Weight:3.9LB
• Ambient temperature:0 ~ 40 °C

Warnings:
• Do not use the smart charger to temperatures over 104°F(40°c)
• Do not expose this product to water,rain,snow,condemsation,or spray
• Do not attempt to fix the unit by disassembling or modification
• Never allow battery acid to drip on charger when reading electrolyte specific gravity or filling battery

Note:
If you want your battery to sustain its life longer, slow charge it. Slow charge will take longer but will charge your battery more thoroughly. If your battery needs to charge in a short amount of time, use the Fast charge