I have owned these for about four months. Mostly they are used in a DSLR camera.
I find that, when freshly charged, they are superb, giving lots of life and fast performance in the DSLR, which relies heavily on good battery power. They also charge fine, with no memory problems, in the Sony charger.
However, these batteries lose power when not in use. Most AAA rechargeables do, of course. But there are a new sort on the market that minimize the power drain when not in use. I have tried some, the eneloops.
They are just plain better than these Sony batteries. Eneloops fire right up and last longer even when they have not been in use for days or weeks. I find this makes a big difference because I don't have to recharge every time I start out a day with my camera.
Hope you find this helpful. Sony 2500 mAh AA Rechargeable Nimh Batteries, 4-pack
I've used these, Energizers, Duracells, etc. These have worked as well as any, and are often sold by Amazon at a very good price. Sony also makes a nice charger, the BCG-34HRMF4. When on sale, with 4 batteries, it's a great deal.
Be aware, though, that NiMH batteries all slowly lose their charge on the shelf, and will discharge in about a month or so, so don't use it for a device that sits around somewhere for long periods.
These are my first rechargeable batteries, so all I can say is that in comparison to alkaline, these are WAY better and longer losting. Alkalines stop working in digital cameras long before they are actually used up, because they can't supply the required current for high-demand devices. These Sonys last much more than 4x as long because alkalines only work for a few minutes. These Sonys maintain their voltage at a stable level. I am using them in an Olympus C-755 digital camera, and I charge them using the Sony BCG-34HE4 charger. I can't say exactly how many pictures you can take on one charge, because they last for so long I lose track. If you have a digital camera, you absolutely must use rechargeable Nimh batteries. Don't waste your money on the expensive "high-end" alkalines or non-rechargeable lithium, etc. Also, you are doing the environment a favor by not using toxic landfill filler.
It's best to charge your high-capacity (2500 mAh) NiMH batteries in an appropriate charger of the same manufacturer.
When I attempted to charge Sony batteries in my Monster charger, the batteries got very hot, never stopped charging, and killed the charger. I tried 2500 mAh Sony batteries in my cordless Logitech mouse, and when the mouse was placed in its charger, the batteries - and the mouse - began to get hot. Fortunately I removed the batteries before any damage was done to the mouse or its charger.
The Sony batteries are fine when charged in a Sony charger. Perhaps someone else will know whether the problem is mixing brands, or mixing capacities. Just be careful which batteries you put in what. -LR
Purchase this as an extra set after receiving Sony charger. The lesson came very soon. I had to rush to a nearby 7/11 minutes before an event. The Olympus DSC showed "low bat" on the 2700maH batteries (came with the charger) after few shots and didn't even like the 2500maH spares that were charged 2 to 3 days prior.
I have done some research and weekly experiments. I refreshed and re-charged repeatedly and measures in-between. The voltage dropped from the ~1.4V to ~1.2V within 3 days on all 8 of them. One tech paper stated that NiMH batteries do lose 1% of their charges in 24 hours at room temp when not in use. The Sony ones must have far exceeded the typcial case. It's winter time in Calfornia and the moisture doesn't come into play.
I read all the reviews before the purchases. I wondered if I were just unlucky until the reviews on the charger revealed the same issue with the batteries.
These batteries are not totally useless. They give you a good day of shooting if you charge the night before. What you lose is the freedom of "grab and shoot".
These batteries work great, but lose charge rapidly if not used right away. I have 4 batteries and when they are fully charged I have never run out of battery power for a full day of picture taking. When the batteries sit around not used for more than 3 or 4 days they lose their charge. Not sure if other brands do the same. All in all I am happy with these batteries. I just charge the batteries before an event. 2 in the camera and 2 spare.
Product is made in Japan. Took around 280 pictures with my Canon S5 and it was still going. The capacity of 4 batteries are shown as 2630, 2640, 2580 & 2710 mAh & the voltage is 1.47V in La Crosse BC-900 charger. It is one of the best price/performance ratio.
I've tested many different brands of rechargeable batteries, and have in total over 40 of them. These are the best so far.
As someone else already stated, they are relabeled Sanyo batteries - which is good!. Sanyo is one of the best batteries manufacturers there is.
When tested, every one of them is over 2300mAh. Consistent performance, long lasting, reliable, made in japan and cheaper than most of the other brands (which perform worse).
Highly recommended. - Sony Battery - Battery - Nimh - Battery Aa Rechargeable'
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