I think it's a good idea with dual chargers.... With 3300 and 6 amps, it takes around 40-45 minutes to do a fully charge... and more if you dead short....
There's a lots of chargers threads. But look for at least 6 amps charge rate, delta peak adjust, the option of disabling trickle charge, adjustable charge rate and linear charge.
Personally, I use the Eagle CDC v6 (alias Integy something), because I find it has very good value for money. But it depends on what you want, and in my case, I'm considering an extra charger....