Kastar NP-F570 Battery (2-Pack) Replacement for Sony L Series InfoLithium Battery NP-F570, NP-F550, NP-F530, NP-F330 and Sony DCRVX2100, HDRFX1, HD1000U, HVRZ1U, HXR-NX5U, NEX-FS100 Cameras

Excellent product! Perfect

Works as they should and lasts.

Not lasting as long as some other I have bought.

I use the F550 size battery for the wireless HDMI receivers. I've good experience with the RAVpower set that I bought few years ago which may be showing signs of age. While I don't know if these will be reliable in the long run, but based on initial tests, these are great batteries. These weigh 1g more than the RAVpower ones and on my HDMI transmitter/receivers, these lasted good 20 min more than those even though they're both rated 2900 mAh @ 7.4v.Another concern I had was the fit as some I've bought in the past was ever so slightly wider than the battery slot of these receivers where I had to fiddle with it to get it in. These fit perfectly in these receivers and I don't have to fiddle with it to lock it in. Overall, excellent batteries!

Form and fit seem good and I can't comment on longevity yet, but the battery capacity seems to be about 25% lower than advertised. I put the new batteries into a Dolgin tc200-i charger for a full charge/discharge cycle and measured 2110mAh on the first battery and 2160mAh on the second. Premium brands (e.g. Sony, Watson, etc.) typically measure a little more than their rated capacity in this test when new. The price is right and these may be decent 2100mAh batteries, provided they don't lose much additional capacity with use.

I'm using these to run an RGB light panel and they work great! The charge time is good, they never got hot, and they hold a charge for quite some time if disconnected from the device you're powering. They're also light enough for a monitor if you need extended run-time for video recording. Highly recommend these batteries!

My lighting equipment and my Ninja V monitor both can be powered by NP-F batteries, so I always like to have some extras on hand. I feel like these 570's are right in the middle range, and not too heavy, and for shorter shoots, last long enough that I don't need to mount a really large heavy battery on my on-camera monitor, and these work great instead. They don't last as long as my 970's, but then again, the weight difference is a happy compromise. I haven't noticed any difference between these Kastar batteries and any other brand, so it seems they all work the same, and last the same amount of time as every other NP-F 570. If you need these kind of batteries, they work great.

These batteries are a more economical alternative to the original Sony batteries. I tested these with an LED panel light and it lasted for the expected amount of time based on the advertised capacity of these batteries.The batteries fit into the batteries slots without needing to use any excessive force.These also work with standard Sony NP battery chargers.