Best Current to Charge 4 Laptop Batteries (3.7V, 2200mAh) in Series: General Formula

I have 4 batteries from a laptop battery each with a voltage of 3.7v and a capacity of 2200 mAh if I connect them together they will give ~ 14.8V current, so my question what current should I charge? Is there a general formula and how is it?

lalu931 wrote:

In this case, 1C current is 2200mah = 2.2A maximum, but it is not recommended to charge with maximum current, for a healthier package it will be less, e.g. 2 A, 1.8A, so that it will last longer for you to charge

No 1C current is a murder for rechargeable batteries, especially without temperature control !!

It is recommended to charge with 0.1C current with a voltage slightly higher than the whole package. In this case, approx. 15V

Ok thank you very much for your help
PS And is there a pattern for loading?

Brentlok wrote:

Is there a pattern for loading?

T = 1.4 x C / I

T - charging time (h)
C - battery capacity (mAh)
I - charger charging current (mA)

You can slightly extend the time by rounding it up to a full hour.

Hello,
your description shows that these are probably lithium-ion cells. It is advisable to charge them using a specialized system that implements the appropriate charging characteristics. If there are any markings on these links (manufacturer, model, etc.) try to look for documentation, the manufacturer knows the parameters of his products best. In general, however, lithium-ion cells can be charged with a current of 1C, in the CC phase, of course.
If they are actually li-ion cells, then theorem

icosie wrote:

No 1C current is a murder for rechargeable batteries, especially without temperature control !!

It is recommended to charge with 0.1C current with a voltage slightly higher than the whole package. In this case, approx. 15V

is (without offense) complete nonsense.
First of all, would you buy a laptop in which the battery charges for several hours?
Secondly, 3.7V is certain conventional nominal voltage lithium-ion cell. In fact, the voltage varies from about 2.8 V to about 4.2 V. A fully charged 4S battery will have a voltage of 16.8 V, I wonder how you want to charge it with 15 V, probably through the fourth dimension.

To sum up, use a specialized charger to charge the li-ion cells. You can charge with a current of about 1C, but it's better to check the documentation if it is possible. If the cells are connected in series, it is advisable to balance them. In addition, you should strongly recommend the use of the "secondary protection" system, which is the "last line of defense" for cells when other systems are damaged. You can remove this system from the battery from which you get the cells, or buy, commercially these systems are called "PCM", the prices are rather low. You need to purchase a chip for your cell configuration, for example 4S.

Regards

It's exactly like a colleague writes in the previous post.
All this fun can be done with the battery: NI-MH, NI-CD.
Aku LI-jon, you have to be careful with them, they can explode and get burned when they are unloaded (you need to control the voltage).
Look in the net, there are a lot of videos, there are people burned.
So if you don't know it, leave it alone, Christmas is coming slowly.
Regards.

szkieletor11111 wrote:

It's exactly like a colleague writes in the previous post.
All this fun can be done with the battery: NI-MH, NI-CD.
Aku LI-jon, you have to be careful with them, they can explode and get burned when they are unloaded (you need to control the voltage).
Look in the net, there are a lot of videos, there are people burned.
So if you don't know it, leave it alone, Christmas is coming slowly.
Regards.

Let's not exaggerate again, it's not some devilish technology.
A minimum of caution plus an efficient safety system will suffice.

I'm not saying it's different.
However, it can be dangerous.
The results of various games are on the net, it is worth to watch this way for precaution.

Thanks for any help closing the topic