Review: FirstPower V Mount battery VB72 $90 скачать в хорошем качестве

Review: FirstPower V Mount battery VB72 $90

Amazon Affiliate Link: https://amzn.to/4heOyLD Price as reviewed: $90 (possibly with a 10% off coupon) FirstPower V Mount Battery with 400W Output, 5000mAh 72Wh Mini V Mount Battery with BP/D-TAP/USB-A/USB-C Ports/TFT Screen, Support 100W PD Fast Charging for Camera, Camcorder, Monitor, Video Light I believe that the actual capacity of this battery is close to 63 Wh (not the 72Wh claimed). I base this estimate upon the fact that it can provide 56 Wh out of the USB-C port, and takes 70 Wh to recharge. Given the efficiency losses of charging / discharging, the halfway point between these two numbers is 63 Wh. [However, 63 Wh capacity isn't bad for a battery at this price point.] The USB-C port is very functional, I've seen it charge the battery at 96 watts, and power my laptop at 50 watts (limited by the draw of the laptop). The USB-A port is also functional, supporting the QC standard and can negotiate a higher voltage with QC compatible devices. The big downside is that the ports are NOT independent, so if you want to use both ports, they simple work at 5 volts. In general, only plan on using one of the two USB ports at a time for high power operation. The D-Tap and Bport on the battery are attached directly to the cells, so they should be able to provide as much power as the cells can. I didn't test their 400 watt total output claim as I didn't have any devices that needed anywhere near that much power. [Given that they overstated the battery capacity, they may have also overstated the total watt output capacity....but I couldn't test it.] If you just need a battery that can provide 56-63 Wh of capacity to a V-mount device, this guy is easily half the price of some 99 Wh competitors I've seen, so the price point feels right for a basic V-mount battery. The screen is perfectly readable, but the "color" is more of a "hint of color" than a fully saturated color screen. I feel like it was the least expensive "color" screen they could source. The screen shows your current battery charge, and how many watts are going in/out of the USB-A, USB-C and DTaP/BP ports. If you tap the button on the side, you can change to a 2nd screen which shows the temperature, a "battery health" rating, and a count of the total number of cycles the battery has gone through. The manual is clear and easy to read, but it does not properly describe the button behavior. When you hold the button for 2 seconds, a small yellow "sun" icon turns on, and if you hold it for two more seconds, the icon goes out. The manual does not say anything about this, and I have no idea what you are toggling on or off with this icon. If you hold the button down for 5 seconds, the battery will "reset" and show a "reset complete" check mark and message. (This is also not mentioned by the manual.) If you have a laptop plugged into the USB-C port, it can negotiate and charge at the 20 volt rate via USB-C power delivery. If you then plug something into the USB-A port, both ports drop down to 5 volts. HOWEVER, if you remove the USB-A plug, the usb-c port does NOT re-negotiate back up to the 20 volt level. (Even if you unplug and re-plug the usb-c cable....) I found I had to hold the button for 5 seconds to reset the device before I could charge my laptop again.