Hellow guys, Welcome to my website, and you are watching What to look for in a Power Bank. and this vIdeo is uploaded by Bhupinder Tube at 2021-04-29T08:15:28-07:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.
| Name | What to look for in a Power Bank |
| Video Uploader | Video From Bhupinder Tube |
| Upload Date | This Video Uploaded At 29-04-2021 15:15:28 |
| Video Discription | In the above video, I assumed IPhone 12 Pro Max battery voltage of 9 volts based on the transfer of energy of its USB adapter (20 W). However, the rough voltage is 3.842 volts. Hence, doing the same calculations, we get 14.13 Wh (3.842 Volts x 3678 mAh / 1000 = 14.1309 Wh). So, now if we divide the power bank with this value, we get 2.75 times charge (38.8 Wh / 14.13 Wh = 2.7459 times). Therefore, in this case mAh and Wh are more closely related based on the 3.845 volts. Nevertheless, the above video demonstrates the importance of volts and hence Wh in comparing the capacity. In this video, I'll discuss everything you would need to know before buying a power bank or power adaptor. You understand things better, we need to learn some of the terminologies. So, let's get started. mAh stands for milliampere hours. Most of the devices and batteries including power banks use mAh to indicate battery capacity. However, mAH is not accurate in determining how much charge you will get out of your power bank. The more accurate unit is Watts hour (Wh). You could calculate Wh from mAH by multiplying mAH by voltage and dividing it 1000. So, how can we determine the voltage? Well, that's the reason why mAH is not a good indicator of capacity. Lithium-ion battery has got a 3.7 volts nominal voltage. Therefore, 3.7 volts is used to convert mAH to Wh. So, a battery with 10500 mAH is marketed to give 38.8 Wh. Another important term is called Wattage. It is the rate of transfer of energy. Wattage = Voltage times electric current. By using international units, Watts = Volts x Amperes That means, if we transfer 38.8 Watts in one hour, then we've consumed all the 38.8 Wh capacity. iPhone 12 Pro Max has a 3678 mAh capacity. If you use an Apple 20 W USB-C power adapter, then it give you an output voltage of 9 Volts. Therefore, if you power bank could match the output voltage of 9 Volts at 2 A. Then, if by multiplying 3678 mAh by 9 volts & dividing it by 1000, you get 33.102 Wh. So, now divide power bank capacity 38.8 Wh by 33.1 Wh, and you'll get 1.17 times full charge. But, if you just compare the mAh, that means dividing the 10500 mAh power bank capacity by 3679 mAh, you will get 2.86 times. So, even though mAh is 3 (2.86) times higher than the phone's battery capacity, at 9 Volts, you would only be able to fully charge the phone (1.17) once by using a 10500 mAh power bank. If you got an older phone, or USB cable that are not C type, then charging voltage would be around 5 volts rather than 9 Volts. So, if you follow the same math, you'll get a closer number of charges between mAh and Wh. Also, if you charge at a constant voltage, but increase the electric current you will get a faster charging. The downside of faster charging is that it produces more heat, hence it can be less efficient. With modern chargers, and devices, the faster charging are becoming more efficient. So, don't about using fast charging. So, next time when buying a power bank make sure you compare the Whs rather than mAh. Another important feature for power bank, USB socket or power adaptor is called USB Power Delivery or PD for short. PD USB can automatically adjust current and voltage to match the device input requirements. To learn more about PD USB, please watch the video to my side. If there is anything that you would need more explanation, please let me know in the comments. And finally, to support my channel, please don't forget to subscribe! If you have any questions, please let me know in the comments below 😊 #BhupinderTube #powerbank 👉More Videos👇 👉 What is USB Power Delivery (PD) and why it's important! - https://youtu.be/vRLhFb_znY4 👉 DVI vs HDMI - https://youtu.be/NjBEKxQ4AtM 👉 What are the 3 audio ports on my PC - https://youtu.be/HZcQzPH4iDM 👉 Windows 10 Tutorials (more than 140 tutorials) - https://youtube.com/playlist?list=PL6oDA8S3RmtGfxxC6s7DjaqR-6XjdNsov 👉 WhatsApp Tutorials - https://youtube.com/playlist?list=PL6oDA8S3RmtHgXSWFSj68YUVm1TIGGTza 👉 Product Review Playlist https://www.youtube.com/playlist?list=PL6oDA8S3RmtEgxFlaZd1x_2QlcihjbFeW 👉 Amazon Website Tutorials - https://youtube.com/playlist?list=PL6oDA8S3RmtFbsUyOgixY8CVgNtSiGJ0d 👉 TV, Sound System & Accessory Tutorials - https://youtube.com/playlist?list=PL6oDA8S3RmtFuqNpAghGWmkIRfBjF3q9v |
| Category | Howto & Style |
| Tags | how to choose a power bank for your phone | best power bank | power bank buying guide | types of power banks | best power bank for iphone | portable power bank | what power bank to buy |
