Lithium Battery Charge Discharge Curve

NOT ONLY does the Watson re-charge the batteries, but it also shows you how close each battery is to Full Charge. One can also discharge the batts in order to perform, what some say is, a more complete re-charge. Soon, I will buy another.

The charge lasts a lot, but when used in flash, I'm surprised it does not discharge as fast as an alkaline battery.

Sometimes I even forget the I have to charge this battery. It's an Info-Lithium Battery with 6600mAh at 7.2V and it have a very long life!

After 4 years, thousands of photos and hundreds of charge - discharge cycles my original NB-13L battery was declining in capacity and needed replaced. Maybe I could have saved by buying a 3rd party battery but I figured the premium price over 4 years comes to about $5 per year and I can afford that for the premium Canon brand.

Where to start? This battery is both durable in it's construction as well as usability in that it can be stacked to add amperage to a battery powered source that requires more than a typical 94wh load, this is genius. The fact that it trickles discharge from the exterior batteries inward means you can hot swap peel away the end battery off your camera/light/whatever-you're-powering while leaving a charged battery on board and add a fully charged pag to the back. This means never having to power down as long as you have 3-4 of these babies charged up. Speaking of charging, they stack and trickle charge as well! 4 Pags per AB charging plate. This saves you space, money and time as well as weight with less chargers needed in your flight case. The exterior power gauge is helpful showing you a rough percentage of remaining battery in numeric form rather than some of the other cyptic icon systems (speaking to everyone, looking at Anton Bauer). I can't speak to the life time of the battery, but it's been plugging away giving ample charge and discharge cycles for the better part of a year with no noticeable memory loss. Do yourself a favor and stop buying cheap batteries and get some PAGs. It'll be hard to go back to non-stackable battery systems after you have a chance to work with these PAGs...

Very simple to use, LCD displays each battery as they charge giving each battery the perfect charge. The discharge and recharge option is very easy to use as well, just the click of a button and it does it all. Great product A+

This charger can charge up to eight rechargeable batteries. It can also discharge them first, if you want, but I don't think that's at all necessary with NiMH batteries. A small display panel below each battery shows the discharge/charge state of the battery in that slot.

I just replaced my 2008 era MacBook battery with a NuPower replacement battery. Right out of the box the before fully discharging the new battery it indicated 65% charge level. This battery is lithium-Ion 54 watt hour, better that the original 45 watt hr unit. Easy old battery out new battery in. Initial charge cycle requires you to fully discharge the new batter before charging. The only drawback was it too so long to discharge the new battery before charging fully. B&H pricing for this battery was less than anyone I could find and shipping was free & on-time!

Have two of these units and use them constantly. LCD screens on one of them have become somewhat dimmer (?), but otherwise unit continues to work as it should. Big improvement over the assorted 4-AA wall bricks I had before. I keep these nicely set on a corner of my camera table. Love to be able to see how much juice actually remains in the batteries, plus it helps to pinpoint which batteries are becoming unusable (in my experience, some batteries from the same batch will die off before others). Also, this little smart thing handles each battery independently, so it doesn't matter if you mix batteries with different remaining charge levels. I have many AAs for my Nikon Speedlights and battery grips, this takes the mystery out of knowing if they're properly charged before going out on assignment. Love the discharge / refresh feature, which I use often. I haven't needed to use the car charger yet, but it's great to have it included, it completes the kit nicely. Caveat: this is not an ultra-fast-emergency charger. Give it time to do its thing, specially if you plan to use the discharge-refresh cycle before charging. Plan ahead and you'll be fine. Consider also that faster chargers take a heavier toll on battery life-span. This is the best solution to charge AAs and AAAs I've had so far. Kudos to Watson (...and to B&H, as usual).

This is a great battery charger. Most importantly it can charge an odd number of cells. My Nikon SB 800 uses 5 AA cells. The typical little charger is will only charge 2 or 4, but not 1 or 3. So you are always out of luck. Furthermore, with most battery chargers, pairs of batteries are in series, so if one needs a lot more electrons tha they other, the second gets overcharged. Not with this charger; each battery is independent. It has a lot of features: It charges both AA and AAA, up to 8 cells. It has an LCD display that shows, for each battery, the progress of the charging, or that it has determined the battery to be defective. There is a discharge mode. (There are 2 discharge buttons, one for each group of 4.) It comes with 2 power cords, one for 100 - 240 VAC, 47-63 Hz, so will most in most parts of the world (bring your own adapter), and one for a car power outlet, so you can charge while you drive. It is not harmed by putting the batteries in backwards. It will work with either NiMH or NiCd, and will detect alkaline and gracefully do nothing. Wow!! It is reasonably small and light. I've not timed how fast it charges, but it seems to be reasonably fast. And it charges up to 8 at a time.