For most applications Accucell 6 (I have one of these actually) and Imax B6 (genuine one) will be best choices. Both are very good 50W power chargers and will handle this battery perfectly. In case of Accucell 6 you will need an additional XT60 to JST charging adapter like PRODUCT ID FXT60-MJST for this battery (B6 is SUPPOSED to provide one). But your question exceeds this battery and let me tell that choice depends mostly in the capacity of the batteries you want to charge. Charger power will limit charging time. Power = voltage x amperage, so, if for instance, you want to charge a 3S LiPo (11,1V nominal), 50W / 11,1V = 4,5A* then, a 50W charger will charge at reasonable rates (1C) any 3S LiPo or LiFe battery up to 4000 to 4500mAh capacity. Of course can charge bigger batteries (6S maximum), but higher capacities and or cell counts will take longer charging time, and in such case you want to consider a more powerful charger. Hope you find this helpful. Best Regards!
Change NiMH On LiPo 2200mAh and has forgotten about problem of the charging on field...
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I have tried out the 9xr battery, and I am pleased with how it works. I put it in my 9xr, and ran it on the simulator. It is holding up very well (all I am running is the TX on it), and I expect no problems.
I am setting up my 12V dremel tool to run on it too (and any 3s LiPo), but I see this one as a good option for it's over and under protection. If my dremel runs it out, it will cut off, so this should work nicely.