Amazon Basics 4-Pack Rechargeable AA NiMH High-Capacity Batteries, 2400 mAh, 1.2V, Recharge up to 400x Times, Pre-Charged

A good bit of time has passed to evaluate these batteries in my ROKU 3 (also purchased on Amazon). In the past, I've noted with alkaline batteries in the ROKU that one battery ALWAYS depletes before the other, usually by 1/4 volt. Having seen that issue several times, usually having had to replace only one of the two batteries, I'm concluding the ROKU remote keeps is continuously connected to the ROKU as long as the ROKU is turned on. This would explain why one battery frequently requires replacing. I have noted this phenomenon with two different ROKU remotes. I don't know who makes these batteries but they are very high quality. Also noted is they are about 25% heavier than the Everedy rechargeables at your local retailer. My weight scale is not digital but is still good enough to discern a difference in marking. These batteries (yes I can test voltage) seem to have significant density and hold a charge quite well for an extended period of time. The discharge time for batteries (battery) in the ROKU is over two months. Also, if I remember correctly, a fresh charge will loose only about 40% of it's charge over the course of a year. Battery technology is constantly changing (see batteryuniversity.com for a true education). To that end, these batteries far surpass the junk sold in retail stores. I've not found a 2400 mAh NiMh anywhere at the price point offered by Amazon. Also, please be advised that most rechargeable batteries do NOT (performance-based) match up to their mAh rating. So I'm not sure how these little guys rate, but I can say ... for the price point they outperform the smaller charge-capacity types found in the average retail establishment selling 1400 to 2300 (rare) rechargeables. In my opinion, they are almost worthless as they need constant recharging. These batteries are new-generation batteries and users will appreciate having them. A couple of additional notes: new generation NiMh rechargeables should not be fully discharged or anywhere close to that. The battery lifetime cycle can be extended greatly by recharging only after about half-use; there is no battery memory problem. The newer NiMh batteries are more subject to "stress" so deep discharge shortens their life. Same for cell phones .. don't deep discharge the battery. The battery lasts longer if you recharge after one or two bars. So anyway, these are really good rechargeables at the price point. I can't imagine better unless you want to put 8 or 10 hours into customer reviews and scouring best prices. Better to go for Kentucky Fried Chicken and a half bottle of Chardonnay with your wife out by the stream on a soft Autumn afternoon. Yes? And don't forget the music powered by the batteries that don't fail, even if you forgot to recharge them. :-)

I have previously tested the AmazonBasics AA Pre-Charged Rechargeable Batteries (in white wrappers), and concluded that they are just rebranded Sanyo...

Whoever makes these, they seem to work well. I'm using them as battery replacements for some Ooma phones.

For the price these are a good rechargeable battery however I'm kinda disappointed in the storage ability. I use these in my Canon speed light and sometimes the batteries sit in a special battery container when not in use for about a week or two. In that week or two when I put them in the speed light the light tells me the batteries are only at 50 to 75% charged. One of the reasons why I chose these batteries was their claim to sit in storage for over a month without loosing any charge, how ever even after a week their charge seems to drop a fair amount. Now that being said if you go through batteries like crazy where you might be charging daily or at least every few days then these would be great for you. They have decent capacity (comparable to non-rechargeable which generally have a larger capacity then rechargeable batteries), seem to be well made and can take the high draw beating that a speed light can deliver (any one who uses a speed light from Canon or Yongnuo can tell you these things eat batteries like crazy). Just don't expect to see it have a full or even almost full charge if they sit for a week or more.

I am fairly new to rechargeables and the first thing that jumps out at me is the cost of any brand with a decent reputation. To me that means spending the money up front to get "smart" charging and evaluation equipment. That reduces the chances of ruining new batteries, or worse yet ruining the devices being powered. I purchased a Nitecore and and an Opus bt-c3100. Quickly I learned to categorize 18650 batteries into three rough groups: total scam batteries that should never be used because they barely put out any power and cannot hold a charge. From reviews I have seen that means 400 mah hours or so from an 18650. The second category is the extremely common "knock-offs" that copy, sometimes well and many times poorly, popular top performers and sell for much less. These from what I have seen and from my own observations can have power output of anywhere from 30% to 80% or so of the power of the tried and true name brand. I thought long and hard before purchasing the newest Amazon AA nimh high-capacity knowing they were not made in the Panasonic eneloop factory and were fairly pricey. But I felt it would be a good learning experience and for now I only power led flashlights and solar walkway lights. The first thing I did was read the directions!!!!!!! and it said charge at 250 mah. The nitecore only goes down to 300 mah so I first discharged them on the Opus at 200 mah for 12 hours 20 minutes to 1-1.1 volts and all four(sorry no statistically significant data from this guy) gave off a measured 2440 or more mah , a little better than the rating of 2400 mah. Charging at 200 mah took 13 hours and the cells absorbed 2570 mah , well above the 2400 rating. I will leave the discharge and power analysis to the electrical engineers with the knowledge, expertise, and software. I will give my layman's opinion that initially these four Amazon high-capacity nimh batteries are not fakes stuffed with sand and appear more promising to deliver good service than the knock-offs that cut critical corners to keep the price down. I recommend to other newbies to take the time to charge all rechargeables conservatively with a smart charger. It is probably a good idea to first discharge and recharge these batteries even though mine came fully charged. You would not take your brand new car and redline the engine out of the showroom. Show you Amazon batteries the same care. Maybe Amazon should offer detailed break-in instructions with all new rechargeable batteries. That could help eliminate many of the bad experiences and bad reviews.

What everyone says is true. These deliver on the promise of NiMH. Coupled with a fully-independent-bay smart charger (I use Opus but it's not the only one) these cells pack a punch and last, and last, and last… if you burn through battery power and have to recharge daily, these are not the cells you want, but if your devices, especially safety devices, sit unused for months or years at a time, then HAVE TO WORK, well, then they should have lithium cells in them. In between, devices that get moderate, irregular use, which is the vast majority of devices, this cell is the ticket. The price for their power density is fewer recharge cycles, but they deplete more slowly (much more slowly when not used) so they need fewer recharges. If you recharge once a week these will last a decade, but I've left them unused in a camera for a month with no discernible loss of capacity. Recharge once a month and these will probably outlast you. That's sufficient.

Great product at a fair price

Sorry Amazon. As much as I love you, I have to start out with two stars. I just got them, so i dont know how well they will hold a charge. I will come back and update. The reason I am starting off with 2 stars is because they are advertised at "Pre-Charged". They were not. I had to place them on the charger for almost 3 hours before they were charged. Since a full charge normally takes about 5 hours, I can only guess they were close to dead. I quick plug into a flashlight before I charged them confirmed this as the light was extremely dim. Two stars because they were supposed to be Pre-Charged. So, either they were not pre-charged, or they were and they lost there charge. This is what I am waiting to find out. If they hold a charge for more than a day, or if they perform very well. Only time will tell. I am using this in an XBox One controller where standard AA batteries go like candy. I am hoping they last me a few days without changing. Ill post back. Update: They hold the charge well. They last a decent time. Using in an xbox controller, I need to replace them once a week of so with a good amount of use. Update - Again Its been a little over a year now since I got these. I got about 80 charges out of them before they no longer can power the xbox controller. Shortly after owning them, the rate I needed to replace them were about every 3 days, so I got about 80 charges out of them before they failed to comply with amazons stated description: "Charge hundreds of times with minimal power or capacity loss". If I had an option to return these I would, but I am only out 13bucks so its not to bad for a year.