Which universal battery to buy?

Question

laptops

It's no secret that most laptops and smart phones with their batteries are in dire need of an outlet. Recently I came across such a topic as external batteries. I wanted to try.
So, you need to choose several types of batteries:
1. Only for a smartphone (m-usb);
2. Only for laptop;
3. For both.
Condition - no more than 0.5 kg; 50$.
Option 1 is located among hotline.ua/computer/universalnye-batarei/34988-349...
Tell me examples 2 and 3.

Answer 1

1. on ibee case for 4 18650 cost 7 dollars + 4pcs 18650 - cost from 15 dollars Search string "18650 power bank"
2. charge laptop batteries from batteries - an unaffordable luxury in terms of energy loss. Best thing is another spare laptop battery. Ebay, we fit in the budget.
3. If your hands are standing correctly, then theoretically you can connect a power bank from p1. to the elements of a spare laptop battery from item 2 and get an option for both :)

Answer 2

On point 1, I can give advice. Just at your link, among the many options, there is what I bought six months ago - in general, here is a review of the Hiper Power Bank MP7500 (see at the end of the article).