I did a google search on a Duracell Mobile Battery Charger and found some thing on the net. It was a review where this engineer type guy had tested the Duracell Precharged Batteries.
He suggested that the Duracells were just like the Sanyo eneloops. These Duracells Precharged are 2000 mAh and are suppose to retain their charge for one year.
I got two Duracell Battery Chargers at the Boonville, IN Walmart but I can't find those models on the Duracell Web Site now. Perhaps they have updated their web site and those were older models? I don't know. Model CEF 23 is what I got. They charge at 500 milliamps. So they are not FAST chargers and will not overheat the batteries. And they will stop charging each cell individually when the battery is fully charged. He said that they will trickle charge the batteries also. Not a bad deal for $20. I picked up two of them so that I can charge 8 batteries at one time in these two chargers.
$40 for two chargers and 4 AA and 4 AAA batteries.
These chargers can be used in a wall outlet or with a cigarette lighter plug. And they can also be used to charge up a USB device. There is a button that lets you switch from charging the batteries to charging a usb device. You can't do both at the same time.
Put in 4 fully charged batteries and then use the charger to power your usb device while on the go.
On the www.duracell.com
web site they sell a mobile charger but it's a one hour charger and not the one that I have now. They have put a new mobile charger on their web site.
NOTE: A few weeks after I posted this I went out and found two of the newer type Duracell Mobile Chargers. These are model CEF26NA. There are the new Duracell GoMobile 1 hour chargers.
So now I have two of the CEF26NA's and two of the Model CEF23.
I still have two of the Energizer Portable Chargers that work on a cigarette lighter or household current. Model CH15MN. There will charge up 4 AA/AAA NiMH batteries in 15 minutes.
I have one other Energizer Battery Charger that I have had for many years now. It's the Eveready Model CH1HR unit. Along with these Energizer I must have about 36 Energizers AA'a and 8 Foxpro 2500 mAh AA and about 16 of the New Duracell Precharged 2000 mAh AA's. I don't really need all the Energizers anymore. There work as designed and they are in good working order. I just charge them up before I use them for hunting.