What the reactor is used for is completing the discharge cycle after a run or to cycle packs. The Octane tray is then used to equalize each cell individually. If you had to get one or the other get the reactor nimh cells will benifit alot more from going through a complete cycle every time than equalization. But idealy both is best, although alot of others seem to think that equalization of nimh cells is not necessary, I do it because I have the tray and think it would be ignorant of me not to use the tools that I paid for. Better safe than sorry.
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