Powerex MH-C800S 8-Cell Smart Charger for AA/AAA NiMH/NiCD,Grey & Precharged Rechargeable AAA NiMH Batteries (1.2V, 1000mAh, Low Self-Discharge) - 4-Pack

BACKGROUND:I wanted a NiMH AA/AAA charging system that would remove the "mystery-of-the-charge" and provide more confidence in the rechargeable batteries I purchase. So, I did a little research like everyone does (or should do) before buying an item that's intended to last for years (find "The Best (aa/aaa)Charger Guide by John Dziadecki on Amazon - excellent read). I decided to buy two 4-packs of Powerex AA 2700's and two of Powerex AAA 950's to supplement some Duracell 2650's, Kodak 2550's, Energizer 2500's and an assortment of generic 2300's. I also bought two chargers: the MH-C9000 and the MH-C800S.For years I've used an assortment of chargers with idiot lights. I had no idea HOW MUCH of a charge those batteries were getting or whether they really held the advertised capacity. But, it was very clear (and frustrating), that some of these batteries and/or chargers were very limited (junk?). I'm not sure how many times I installed newly charged NiMH batteries into a digital camera only to have the low battery icon show up after a couple shots: "Hmmmm...how many of these batteries are duds?" And, generic battery testers really don't tell you much, i.e., how 'good' is "Good"; How 'low' is "Low"? .....So, it took me a while to get fed up.MH-C9000 Charger:This thing definitely took most of the guess-work out of my rechargeable AA/AAA energy supply. I was able to get rid of six old NiMH AA's in the first week and "rescue" seven others with this charger. The directions with the charger are a little sketchy but, if you know the advertised capacity of your battery and its age, you'll be able to figure out how to best charge it and how many mAh's are available to you afterwards. You'll also be able to determine if the battery is shot. This isn't something you get to do with idiot-light chargers (which work just fine for lots of people). I remain very impressed with this charger.MH-C800S Charger:I bought the MH-C800S to supplement the -C9000 because of its 8-battery capacity. This charger does not provide battery capacity values at the completion of a charge cycle. It does however, have a 16-hour 'conditioning mode' designed to re-juvinate and cycle (discharge and recharge) batteries: it works very well. If you don't care about actually 'seeing' the specific capacity of your batteries, the MH-C800S is a good choice at the right price. It too will tell you if your battery is shot. This charger is all that most people will need or want for AA and AAA re-chargeables.CAPACITIES:I have not used Powerex re-chargable batteries long enough to comment on their discharge rate. But, thus far I haven't seen a difference between my older 2300 and 2700 mAh re-chargeables and the Powerex batteries. It's also too early to determine if the Powerex batteries will last through 1000's of charges.The Powerex AAA batteries have an advertised capacity of 950mAh. They charged out between 956-967 in the MH-C9000's "Break-In" mode. Allowing for heat attenuation, full capacity is about 920. I'll know more when I recharge them.The Powerex AA batteries have an advertised capacity of 2700mAh. They charged out between 2556-2650 in the MH-C9000's "Break-In" mode. Allowing for heat attenuation, full capacity might be about 2300. I'll know more when I recharge them.Some of my older batteries charged out at significantly higher rates than advertised after putting them through the MH-C9000's "Refresh and Analyze" mode: these older batteries are holding charges longer and they discharge more consistently. I can tell that those instances of partially-charged batteries screwing up the camera's current requirement will be fewer. At least now, I'll be able to sort out the weak, lame and starving in the herd.SUMMARY:Of course, there are other ways to do what I did. The Powerex battery purchase was based on the charger purchase: I figured it best to stay with a certain brand and keep the system homogenous. Not necessary at all. The price was right for the batteries and they came with convenient storage cases. In time, if Powerex batteries don't perform well, I'll probably start replacing all my batteries with an assortment of Sanyo Eneloops. I'm in the process of learning what a good rechargeable AA/AAA battery really is.There are several other chargers that perform similar to the MH-C9000 and -C800S: LaCrosse, Sony, and/or Sanyo. Reviews for the Powerex MH- products appealed to my technical comfort level and budget. Good stuff!

Update: Reducing to one star.I bought this unit in Nov 2019, and paid a pretty high price for it. It's Sept 2021 now, 22 months since original purchase. For the past six months it has begun to occasionally overheat batteries to the point where their covers melt; and now it's doing this to even brand new first-time-ever-recharged batteries. I used to think it was because the batteries themselves were faulty, and disposed of several that were "fried." Now I know it's not the batteries. I always set the system to "soft charge," to avoid precisely this scenario.The unit has utterly failed shortly after the warranty or support intervals, and I don't dare charge anything in it anymore.Don't buy it unless you can afford to replace it at regular intervals. And be observant.=========I love this charger! Or at least, I *would* love it, for all its great features: not having to pair batteries is huge, as is being able to see (if you have lots of light) the state of any individual battery. The options to be able to choose between slower charging, re-conditioning (and I have a lot of batteries that need rejuvenation, so I was happy to have this option and for it to be clear how to employ it), and the default, fast charging, are easy to understand and execute, and it's great to have all of them.My one and only complaint after a couple weeks of use is that the LCD display is awfully hard to read in low light, which is the unchanging situation, where the unit lives. I have to take a flashlight over there to see what's up. There's no option for even a temporary backlight. I'd readily pay a few more bucks to be able to see all the status symbols clearly, without having to go find a light to shine on the display.So: it works as advertised, as far as I can tell, but *seeing* that is difficult. Needs an upgrade in the readability department.