Originally Posted by
Stanfsu
Trying to decide if I need to get one. It seems that everyone at the track has one. Why do they use them? I currently use 2S and 4S lipo's using an Onyx 235 charger.
Short answer ..
The number one reason is to power a charger. Some chargers are DC only and require a power supply. Other chargers benefit from being able to charge at higher amps.
Your Onyx can only charge up to 5 Amps while using AC input, if it was connected to a power supply it could charge up to 8 Amps (assuming the power supply is rated above 8 amps). Charging at a higher amp rate decreases the time it takes to charge your pack.