How to choose a Power Bank for a laptop?

Question

Iron

Hello.
I recently purchased a used ASUS X552CL laptop and have 1 more question about it. There is a new 2600 mAh battery, it lasts for a maximum of 2 hours. I would like to purchase some kind of Power Bank for it, but I don’t know which one is suitable. As I understand it, his charger is 3.42 A, but almost all "power banks" are 2-2.5 A. Is it really possible to find a Power Bank for a laptop? And how much capacity does it need?

Answer 1

Everything is about the same as described by SyavaSyava, only even worse.
The power (energy) of this power bank will be less, the capacity of 20,000 is the capacity of the elements themselves, that is, it must be multiplied by a voltage of 3.6 volts, 72 watts per hour. He will not give them all out, because there is a step-up converter up to 5 volts, the efficiency of which is not 100%. Then you need a step-up converter up to 19 volts, for a current of 3.5 amperes, if you make it as high quality as possible, it will be a rather cumbersome thing and still we will lose 5-10 percent of energy on it. Plus losses in the charging circuit of the laptop itself (5-10%). In addition, the bank will not be able to give all its energy, when the voltage on the banks drops below the threshold, it will turn off.
Therefore, taking into account losses, we can take a maximum of 50 watts of energy. And the most important thing is that in addition to charging the battery, the power bank will also power the laptop if charging is done during operation. And the current consumption of the laptop will be approximately 1.5 amperes, depending on the processor load, screen brightness, etc. We get that a working laptop will eat approximately 1.5 * 19 = 28.5 watts of energy per hour. The charging circuit in the laptop is optimally configured for charging lithium-ion batteries, it charges them with a current of half capacity, the average charging time is 2 hours. 28.5 * 2 = 57 watts of energy will eat up a working laptop in 2 hours (during charging), plus we need 37.5 watts of energy to charge the battery.
We get 94.5 watts, we need to charge the battery on a working laptop, but we have only 50. In general, this power bank is not enough even for one full charge during operation, it will last for about an hour of work, plus during this time it will charge about half the battery in the laptop.
Cheaper and easier for this purpose to buy a second battery for the laptop.
UPD: I forgot to write. It is this Xiaomi PowerBank 20000 that cannot be adapted without alterations, the current maximum board inside gives out 2 amperes, if you connect a step-up converter to it, it can only charge in the off state. And if we turn on the laptop, then there will be an overcurrent, the protection will work. We'll have to disassemble and redo it, and there will be enough space inside to put a more powerful converter.

Answer 2

Another would argue - I will not! You can’t find a power bank for your laptop, I’ll say from my own experience that there are very few laptops that power banks are suitable for. I bought a new xiaomi power bank for my macbook 12 on Avito, it is enough for 1 full charge, but if you sit in it, it is discharged.

Answer 3

Hey! I was looking for a new powerbank for my laptop, so that the old thinkpad could immediately power it and, if necessary, macbook 12, and here is your topic.
On the topic - I did not find a new and universal one, only the old one will have to be finalized. By the way, the old one has an adapter for usb-c, but it doesn’t work with a macbook, you need to do the strapping yourself for this business.
Now I have a similar powerbank that fits the parameters, it only weighs 1.5-1.9 kg, about the same as a laptop, and I use it very rarely. It gives out quite stable 19v if necessary and it is enough for 1-2 charges of the macbook pro of those years when I took it (2014-2015), in the same way it charges dozens of devices for a week, I usually charge it once every six months and use it as needed ( there is no light, somewhere far from intelligent beings). Sometimes I drag it as a ballast on flights, crossings through cities (buses do not always have working sockets, this thing saves).
Now this miracle of technology costs ~ $ 100. This miracle of technology looks like this: