i have longs brand batteries in my receiver but im about ready to change them i have a volt meter so i check each cell and i have a cut off point were i Thro them away and ya i do have mach packs i go threw all my bats and match them they work good i just rubber band them together Ive matched a pack with 1.67 volts in each cell that was a good pack ya i use the cheap bats when i dont car im not racing so there is no need if it moves im happy
ya i use Duracell in my controller