Don't use a 1 hour charger, guaranteed way to wreck virtually any battery.
Do use an intelligent charger that won't overcharge them.
Don't bother with NiCad batteries, they were possibly the worst battery technology ever introduced.
I back up the comments about eneloop, you might find them badged as Panasonic now since the takoever a couple of years ago.
The recommended rechargeable batteries are Nikon EN-MH2, which aren't badly priced.
Especially with Nikon, check the camera firmware is up to date to support NiMH batteries.
Personally, I use cheap NiMH batteries as I'm not bothered about discharge rate, if I'm going to use them, I charge them and I charge them about once a month if they are not used (I've charged about 20 batteries in the last 24 hours).
Don't leave any rechargeable battery in a discharged state for any length of time. All rechargeable technologies (lead, lithium, Nicad, NiMH) do not like remaining flat.
Always have a spare pack to hand, most makes of batteries have the occasional duff one that just gives up the will to live when you least want it to.
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell
When the debate is lost, slander becomes the tool of the loser. Socrates