Most chargers with built in power supplies are only rated 50 Watts/6 Amps, some go up to around 80 Watts/10 Amps (I have 2 of these Traxxas 80 Watters). My Traxxas can charge a 3300 mah, 6 cell battery at 1C (approx 1 hour) which is the battery I use for the 500/550 class heli. If I wanted to charge 6 of these using a my Traxxas 80 watt charger it would take approximately 6 hours.
With a more powerful charger with an external power supply, I can parallel charge 6 of these 3300 mah 6 cell lipos in 1 hour. I used to charge Lipos the day before I fly the helis but the problem is you really are not sure if you can fly the following day because of various factor (weather, etc.). As you probably know, it is also bad to leave Lipos fully charged and it is recommended to keep them at storage voltage (3.85 volts per cell which is 50% capacity) when not in use.
There are additional advantages to having separate charger / PSUs and these become more readily apparent if you start flying large helis.
In my case, I always keep a keen eye out for what is happening around me. When I sense danger in the horizon, I make the move. You have to be proactive to survive in the concrete jungle. Moving from time to time is one way to survive... the snipers will have a hard time taking a bead at you in their scopes.
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With a more powerful charger with an external power supply, I can parallel charge 6 of these 3300 mah 6 cell lipos in 1 hour. I used to charge Lipos the day before I fly the helis but the problem is you really are not sure if you can fly the following day because of various factor (weather, etc.). As you probably know, it is also bad to leave Lipos fully charged and it is recommended to keep them at storage voltage (3.85 volts per cell which is 50% capacity) when not in use.
There are additional advantages to having separate charger / PSUs and these become more readily apparent if you start flying large helis.
So I think after I fix it all up today I'll build a nice ramp and jump this baby over some garages and houses.