I have had disappointing results with the rechargable battery experience over the years. I bought rechargers twice and don't use them.
Perhaps I will give it another try with the new info about batteries from this link.
Free to canoe
I've been disappointed too. A couple times, I've had a battery leak and destroy the charger before I recouped my investment. Sours me to investing more money in these things. Maybe the new ones are better.
But regular old alkalines are better than they used to be, too. The shelf life is so good, they are great for seldom used items, or low current items (clocks, remotes, smoke alarms). And many battery operated things are either so efficient that it makes little difference, or they include their own rechargeable lithium (iPods, GPSs, cell phones, etc), so no need.
They probably make a lot of sense for someone regularly using AA powered walkie-talkies, or something like that. But I really don't have much need any more.
This is the main thing to watch for with rechargeable NiMH in my experience. Since each cell has different capacity, sooner or later lowest capacity one will discharge but other cells will drive it forward destroying it.
Very true. An important design feature to look for is that the charger should charge each battery independently. Charging two or more in series is bad.
For example, consider two batteries in series, one is down to 1.0V and the other is at 1.2V. In series, they get the same current pumped through them by the charger. That means the 1.0V battery 'sees' 1 watt, the 1.2V battery 'sees' 1.2 watts. So the lowest charge battery gets the lowest power applied - just the opposite of what you want. That will tend to equalize as the cells reach full charge and level off at their max voltage, but it still isn't good. Especially bad if you pull them out before fully charged - that can just keep degrading the weak one over and over.
-ERD50