Energy stored in the battery is turned in to heat. The heat sink and fan are there to dissipate that heat. Testing Methodology RAVPower or Neewer are the best batteries. While they don’t meet their labeled capacity, they are close. What they do have is higher tested capacities than the labeled 1020mAh of a genuine Sony battery. 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. 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.

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. 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 ChargerLooking to upgrade your equipment? Get competitive prices on major brands with our part-exchange service. Batteries will slowly discharge over time. This is an issue with high drain rechargeable Ni-MH batteries. There was almost no change in charge of the FW-NP50 batteries over the course of a week. Self-discharge is not a problem you have to worry about.

Submit a valuation request and we'll provide guide prices with no delay. Plus, we'll collect your gear from your home or work for FREE. 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. 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…Differences in price mean you can get 4 RAVPower or Neewer batteries for the price of 1 Sony battery.