3A charger is 50% faster than 2A charger. 5A charger is 150% faster than a 2A charger.
AC to DC 42V 3A Fast Battery Charger .Input: AC 100-240V, Output: 42V 3A, 50-60 Hz.Don't use it for Lead Acid battery pack.
Output Plug:3A-DC5.5-2.1/2.5mm .If you need other plugs, please choose another option. There are 2 plug styles to choose from.
42V Fast Charging Lithium Charger with LED Indicator: lamp glows red when charging and green when charging is complete
Multiple Safety Protection with 6 Safety designs make you safer and more assured in use,Overcurrent protection, Overvoltage protection, Short circuit protection, Overheating protection, Overcharge protection, Reverse protection