The Sanyo eneloop cells can be recharged using any good-quality 'smart' chargers designed for NiMH cells. For the sake of battery lifespan, avoid timer-based overnight 'dumb' chargers, and '15-minute' ultra-fast battery roasters.
As a general rule, any brand of NiMH cells can be recharged using other brands of NiMH chargers. But the manufacturer always tell you to use only the same brand - for obvious reasons.
The Sanyo MQN06 charger included in this package only charges in pairs. If you just put in one cell, NOTHING happens. It is a semi-smart charger, meaning that it monitors the combined voltage of two cells, and stops charging when AT LEAST ONE cell is fully charged. This prevents over-charging, but one cell may be under-charged (if you group two cells of different capacities in a pair).
Is the MQN06 good enough for your application?
IF all your battery-operated appliances use even number of cells, AND you only use idential cells in them, AND you make sure not to mix-up cells from different appliances, THEN it is acceptable to use this charger.
Otherwise, get at least one charger that can handle individual cells. For example: Sony Cycle Energy BCG34HRE4KN Quick with Refresh Charger and 4 Pre-Charged 2000 mAh AA Batteries