I don’t understand the benefit of using cells in parallel in a AA light. I get it with lithium-ion (it’s generally safer), but why with an already-safe chemistry like NiMH? They still need to use a boost-driver (which adds some inefficiency the more you need to boost). Is it just amps? Unless they’re using more than 5 amps, a single Eneloop should do the job. If they want to use 2 (or more) cells, why not put them in series so you get a voltage closer to the forward-voltage of the LED, and use half the amps for less loss due to resistance in all the contacts?