K&F Concept 2 Pack NP-F970 Battery with LED Charger, Compatible with Sony NP-F550 F570 F750 F770 F930 F950 F960 F970, High-Power LED Lights, Monitors, Camera Sliders, and More

I'm very impressed with how well these batteries perform at this price point. It's an amazing value.

As a rule of thumb, I avoid purchasing low cost batteries from unknown brands because they can ruin your gear or even cause safety problems, so I'm so glad this is from a well known and trusted company.

K&F is a well known brand that I've trusted for years and although they're primarily known for their filters, I've used quite a few of their other accessories and I've never been let down once.

This is a two pack of Sony NP-F970 compatible rechargeable (LiIon) batteries. It also includes a USB powered 2-channel battery charger.

The batteries exceeded my expectations (and the 47.52 Wh rating on their nameplate), running my 20 watt lights for 3 hours and 10 minutes before shutting down. It took around 72 Wh to recharge each battery, and even at an 80% efficiency rating, that's still a capacity close to 57 Wh per battery. So I feel confident in saying that they will meet their 47.5 Wh rating over the first year or two of their life with no problems.

They snapped into and fit my battery charger and lights perfectly, so no problems with fit and finish.

They do NOT have extra features I've seen in some other 3rd party NP-F970 style batteries, such as an on battery power gauge or built in USB charging port, so you need to have an external charger to recharge them. (Or get an idea of their current charge level.)

The 2 pack includes a small and lightweight USB powered charger and a USB-A to USB-C cable. [The charger accepts either a USB-C cable or a Micro-USB cable.] The package does NOT include a USB power supply, so you will need to provide your own USB-C power adapter (or a USB-A [rectangular] outlet capable of providing 5 volts at up to 2 amps). The USB-C port on the charger supports and successfully negotiates USB-C power delivery (PD) but only supports a 5 volt input level. So the charger steps up the 5 volts at 2 amps input to the 8.4 volt charging voltage needed by the battery. With a single battery, it can charge at 700 mA @ 8.4 volts, or 6 watts, and with both batteries plugged in they each get 500 mA @ 8.4 volts, or 4.2 watts each.

As you can tell by the small watt numbers, this is a slow charger. In fact, it takes this charger about 16-17 hours to fully recharge both batteries from a completely empty state. It works fine, meets all of it's specifications, but is only suitable for very low duty cycle charging. If you just need to keep the batteries plugged in to make sure they are ready to go when you are, and can handle recharging taking overnight or longer, it will meet your needs. However, if you need to recharge these batteries quickly or cycle them fast for continuous usage, you'll need a faster charger. I would consider this charger a "bonus" and not the main part of the package.

In my opinion, the two batteries alone justify the price, although if you don't already have a faster external charger, you may wish to consider batteries that include a built in USB-C charging port and a LED "fuel gauge" built in.

I was a bit iffy at first cause I know K&F does lots of lens filters, but honestly these batteries are awesome!! They hold charge perfectly! 5/5 stars