also, i forgot to add to my above post about the C9000 charger...
charging at half of the capacity of the battery (so a 2000mah rated AA Eneloop charged at 1000mah) means it will take 2 hours (give or take) to a full charge if the battery is empty. then after it says 'DONE' on the C9000's screen it actually tops off the batteries for another 2 hours at a 100mah charge rate and then shifts to a 10mah trickle charge until the batteries are removed from the charger.
so if you want a full 100percent charge on the battery you are looking at about 4 hour charge time (assuming the batteries are empty before re-charging). the C9000 typically shuts off the charge @ about 1.47v and then shifts to the 100mah top off charge for 2 hours and then onto the 10mah until the batteries are removed. with Eneloop's though those tend to eventually peak at 1.49-1.50v (should be at least 1.48v especially after a fair amount of cycles as it seems it will take a fair amount of cycles before the capacity peaks in Eneloops) if you let it finish the 2hours after the initial main charge finishes.
but basically there is really no way around that type of charge given the way NiMH batteries work from what i have read as you can't quick charge it to full capacity as it's got to slow charge it when they are close to full basically which is where that 100mah top off charge comes into play which starts after the C9000 says DONE on the screen. plus, doing it that way is easier on the batteries which should extend their life some especially on high quality batteries like Eneloop.
p.s. but basically Alkaline batteries suck as they can leak and NiMh wipes the floor with them in higher drain devices as Alkaline batteries just can't hold their voltage up if your device really sucks the juice from them. but basically... the more power your device uses the more benefit you will get from NiMh over standard Alkalines. low drain devices really won't benefit from NiMh as it's best to use NiMh in medium to high drain devices since you will get the most benefit and save the most $$$ that way.
also, it's recommended that you do a BREAK-IN cycle on new batteries (especially non-high quality ones) which takes about 39-45hours to complete. as i had one Energizer AAA battery that missed termination (i.e. did not stop charging it like it's supposed to with the 'DONE' on screen) one time and overcharged it as i think it pumped in about 2000mah+ or so into it which it should never do but after that i did a BREAK-IN cycle on them and never had a issue since. i imagine Eneloops you probably don't have to do this (being they are high quality) but i would for good measure.