Mine is the Imax B3. Less than nine bucks, only does 2s and 3s and takes about an hour to charge a 3s. Gotta be patient with shipping, though... I'll need to upgrade when I go to bigger planes and batteries, but for $8.68? Hard to beat. Here's where I got mine:
I'm a big fan of the ISDT Q6 chargers. I have a pair of these chargers and they can either drive a multi-battery balance board or just one battery at a time if you want to really shove the amps into something quickly.
I like the HiTec RDX. It’s the first charger I got, and it’ll do 1s all the way up to 6S. I’ve only charged 1 battery at a time on it for safety, unless you count the multi board I have for 1s batteries for my TinyWhoop.
It works GREAT, runs off of AC and DC (which is important; our field has solar chargers and we can charge straight off of those in DC, and don’t have to use a car battery or a generator), and it’s small enough that I can throw it in my backpack or an ammo box that I use for tools. I want to say it’s about the size of a thick Tom Clancy Novel.
I paid $60 for it, but it does my 3S and 4S batteries, no problem. Some people here don’t like HiTec because they’re not cheap, but if it’s quality and it does everything I want and more, all in one package, and I don’t need a separate power supply, I’d say I’m good. 😁
And really, it comes down to what works best for you. I love that Venom Pro Duo, but it’s a little bigger than I want and it’s a little bit more than I want to spend. Does that mean it’s bad? Heck no! It’s a great charger! It’s more than I can justify. I’d rather spend the money on a few extra batteries and charge them the night before or as soon as I get to the field. 😁