How to charge a battery from a cell phone without using the phone itself?

Question

Microcontrollers

Hello! I have a couple of cell phone batteries. And it’s a pity to throw them away, but you won’t be able to charge them, because. the phone is over. Tell me how they can be charged without using the phone (the chargers from these phones are left)?

Answer 1

The device in the common people "Frog" will help you.

Answer 2

In general, lithium is best stored at a charge of 40%, this is 3.7v at the terminals in the refrigerator, and not inserted into the phone.
Check how much is there now with any multimeter, how much is there, you may not need to recharge. And so - a frog.

Answer 3

Buy ready-made or assemble a charger for Li-ION . If you say that the phones are not working, then you can somehow use the contacts / battery compartment from there. It is only important to take into account charge current , it is calculated based on the type and characteristics of the cell. The charge current is proportional to the capacity of the battery.
"Charger from the phone" - now it is most often a mains stabilized source of constant voltage. In most cases 5V. The battery charging circuit itself is in the phone.
Can be used to power devices, charge other phones (change the "tail"). Again, take into account the output voltage and "charging" power and the needs of the powered device.

Answer 4

To do this, it is enough to buy a portable charger. To recharge my phone in non-standard conditions, I have a universal charger on a SITITEK Sun-Battery SC-0 solar battery. I attach it to a backpack or a bicycle in the summer and a 100% recharging guarantee.