Opening the RAVPower and Neewer batteries did not reveal any information on the cells used. Internally, the battery protection boards appear to be the same. I would not be surprised if they were made at the same factory. The Best Third-Party NP-FW50 Battery Is… After seeing that it worked, I took it apart. There’s not much inside. The case is either glued or plastic welded together. I would not recommend disassembling the charger. My Sony A7 gets about 2 hours of life out of a battery. A 500mA load was used because it would drain the cells in approximately 2 hours. Energy stored in the battery is turned in to heat. The heat sink and fan are there to dissipate that heat. Testing Methodology When the cell reaches 3V, it is considered fully drained. Discharging the cell past 3V can shorten the life of the cell. The cells are in series, so 6V was used as the cutoff for the batteries.

Battery Pack - InfoLITHIUM W Series | NPFW50 Sony Rechargeable Battery Pack - InfoLITHIUM W Series | NPFW50

At the end of the week, all of the batteries read 0.02V lower. This is a negligible amount. You would not notice the difference in charge from a battery that sat for a week. All of the batteries started as showing a 100% charge in my Sony A7. Neewer & RAVPower USB Battery Charger

Specifications

Comprehensive safety features built with a high-quality fire-resistant construction and surge protection The charger has multiple circuit protection to prevent over-charging short-circuiting and overheating The TEC-06 is a USB powered battery capacity tester. A test load can be placed on a battery. The measured capacity is displayed on the screen when the battery is fully drained. Extra lightweight battery case easily store with your equipment moisture proof case for your peace of mind

NP-FW50 Battery, 1500mAh Batteries and LED USB Charger with NP-FW50 Battery, 1500mAh Batteries and LED USB Charger with

If you need a USB NP-FW50 charger, this one charges batteries. I am going to continue to use it. If you want an adapter that plugs into an outlet, get a DigiPower TC-U450. Sony Cameras That Use NP-FW50 BatteriesExtend your photoshoot shoot for longer with two large capacity replacement batteries (1100mAh/83 14W) and a dual slot Charger If you’re cheap like me, you don’t want to pay the high-price for an OEM Sony NP-FW50 battery. The price isn’t terrible if you only need 1 extra battery. Unfortunately, one of the problems with the Sony A7 is the short battery life.