Powerextra 3 Pack NP-FZ100 Battery 2500 mAh and Triple Slot LCD Charger,Compatible with Sony a7iii A7iv FX3,FX30,A6600,A7S III,A7,A1,A9,A9R,A9S,A9 II,A7RM3, A7RM4,A7C,A7RIII,A7RIV Digital Cameras

I purchased the Powerextra 3 Pack NP-FZ100 Battery and Triple Slot LCD Charger as extra batteries for my Sony a6700. While I knew they wouldn’t match the performance of the original Sony batteries, the deal was too good to pass up — three batteries plus a charger for less than the cost of one original battery! Bargain!!So far, I’m happy with the purchase. Performance wise, the batteries don’t last quite as long as the original Sony ones, but they hold a decent charge for most shoots. The charger is a convenient addition, allowing me to charge all three batteries simultaneously. The LCD screen gives a clear readout of the charge levels, which is a nice touch and there are two usb charging options that can be charged via mains or a powerbank on the go.If you’re looking for affordable backup batteries and are okay with a bit less longevity compared to the originals, this set is a great value. It’s perfect for casual use or extended shoots where swapping out batteries is a viable option. Just don’t expect the same endurance as the OEM batteries. Overall, a solid purchase for the price!

I've used these batteries full time for a couple of weeks since purchase.Let's be realistic. 3 batteries and a charger for under the price of one replacement sony battery. Bear that fact in mind.Charger is well built, charges 3 batteries, and does so from empty in around 2.5 hrs.The batteries fit the camera well, and in the a6700 running 1.03, there are no issues. Battery level displays on the camera with no resets required. No warning either.My main metric is shooting swifts and Martin's. 2 hr session non stop. And I mean non stop. Camera permanently activated and pretty much focusing and shooting. 2 hr session...... 38% left.Anecdotal, but the shutter sounded a bit crisper and quicker with the batteries, but no really way of measuring and proving.So I'd say these batteries probably run at 90% efficiency usage wise compared to the Sony battery.The only point worth putting in negative is they dont hold their charge as well as sony when sat on the shelf. Again, I'd say around 10% drop in efficiency.But having a triple charger. I just make sure all batteries are on charge the night before. No charge drop. Drop seems to occur after around 3-5 days.So great as back up batteries. If your sony dies, I'd still recommend replacing it with oem. But these are great secondary cells, even for professionals. No rapid drop off towards lower end of the battery from what I've seen, so you can be fairly confident that once you get to say 15%, just change the battery when shooting allows.Great value. Added longevity for shoots, and overall for what I paid, I'm very happy.Again if a professional, I wouldn't rely on them for an expensive one off shoot like a wedding. Notthat they wouldn't perform, but for piece of mind.... More of a Use as a back up. But for anyone else, absolutely fine.

I have long been nervous about using third party batteries in my expensive digital cameras. My main concern is they may cause damage. A problem with lithium battery cells, is if they are poorly designed and/or manufactured they can get excessively hot, swell and even catch fire. I wasn’t keen on taking the risk.I recently purchased a Sony A7C camera on prime day. To my disappointment it came without an external charger, which I consider essential. A new Sony external charger was £85 and a spare Sony OEM battery £65, total £150! PowerExtra were selling three replacement batteries and a three cell charger on offer for £32. Even better the PowerExtra batteries were specified as being 2500mAh capacity compared with Sony’s NP-FZ100 battery which is only 2280 mAh, i.e nearly 10% greater capacity. I decided to try them out.Before using the batteries I decided to do some comparison tests between the original Sony NP-FZ100 battery (which was new) and the three PowerExtra equivalents (also new). I ran two separate comparison tests, to monitor battery drain and camera temperature under two different load conditions. For both tests I used a two channel thermocouple based thermometer. One thermocouple was used to measure the ambient temperature, the other was taped to the back of the camera behind the screen, close to the battery compartment (see image). Once the thermocouple was taped in place I closed the screen to maximise the heat in this area. This enabled me to determine if the camera/battery was getting too hot.The tests were as follows:Test 1 - Continuous high drain: The camera was set to video mode and the video was set to the lowest resolution and frame rate. The rear display on the A7c was on and a fully charged battery inserted. The camera was pointed to a blank wall and the video recording was started. Every ten minutes I measured the battery state of charge as displayed on the camera along with the ambient temperature and the temperature of the camera. The video was continued until the battery percentage fell below 20%. In case you are wondering why not set the camera to maximum resolution and frame rate? The reason is the CCD on the camera in this case could get very hot and lithium batteries tend to fail when they get too hot, so I didn’t want to risk that happening. Twenty percent was chosen as the point to stop testing because it isn’t good for the battery life of Lithium batteries if they are deep discharged. Immediately after the test I removed each battery and measured it’s surface temperature.The table attached shows the results. I was encouraged that throughout the test the camera remained below 38 deg.C which is no hotter than taking your camera to a hot climate. The difference between Ambient and Camera temperature was slightly less for Sony peaking at 12.6 deg.C compared to 14.2 deg.C for powerextra, this doesn’t concern me. There was little difference in the temperature the camera reached between the Sony battery and the PowerExtra batteries. In addition when the batteries were removed all batteries came out easily suggested there was no swelling of the battery cells and they were all around 35 deg.C. Based on this test with the batteries I had purchased I felt reassured that the PowerExtra when new should not result in the camera overheating.What was however interesting was the discharge rate. Due to the higher stated capacity I was expecting the PowerExtra batteries to discharge at a similar or better rate than the Sony NP-FZ100 battery, but this was not the case. All three PowerExtra batteries performed almost identically, the time to discharge from 100% to 20% was 2 hours 20 Minutes and they discharged at an approximate rate of 6% every 10 minutes. The Sony Battery on the other hand lasted 50% longer taking 3 hrs and 30 minutes to discharge to 20%, it had a discharge rate of approx. 4% per 10 minutes of use, again 50% better than PowerExtra.Test 2. This was a simple slow drain test. The batteries were fully charged, then the camera was switched on. Every 30 minutes I checked the battery percentage. After ten hours of being switched on the Sony battery had only lost 3% of charge (re-assuring for those who switch the camera on and off when out and about, it really isn’t necessary). The power extra batteries discharged by 6%, 13% and 15%. Again they did not perform as well as the Sony Batteries.Conclusion:I am a stills photographer and I am comfortable that the batteries are unlikely to cause damage to my camera based on these basic tests. I do not expect them to perform better than the original sony batteries, I would estimate they behave similar to a battery of 1500 mAh. However I consider that for my stills use this will be absolutely fine and more than adequate as a backup battery. Sure they do not appear to have the capacity of the original Sony battery, but the total capacity of the three by my simple estimation is akin to two Sony batteries. At the price point they are an excellent alternative if you take the lower capacity into account. If you are expecting better performance than the Original Sony battery, you will be disappointed.For video photography however, you need to consider that they do not appear to last as long as the originals and my tests were at low resolution settings. Shooting at higher resolution may highlight even more drop off in battery charge compared to the original Sony battery. If you shoot a lot of video at high resolution you would likely be better purchasing the original Sony batteries.Overall I consider these batteries to be excellent value for money and rate them accordingly at 4 stars.

These are brilliant price for great batteries. The charger is wonderful and can charge or three batteries at the same time.I would say the batteries last about 25% less than an original Sony battery. However, the fact you have so many of them and they’re so much cheaper as one Sony battery would cost the same price as all three of these batteries with the charger.I’m based on that I wouldn’t buy another Sony battery. I would buy these every single time and just have one Sony battery that comes up with the camera.Demi batteries lasting a huge amount of time is not a big issue as I tend to have my camera plugged into external power because I do live streaming. I need the camera to be running for multiple hours at a time without having to change batteries and the signal dropping out for a few seconds.Not only do, I recommend this, but I am buying some more soon. It’s much more convenient being able to charge three batteries at the same time.