18650 charge question

rexgoodwin

New member
Joined
Mar 12, 2021
Messages
29
Is it possible to use a 15A charger to charge a 210A battery with 30Ah (48V: 13S14P)? Each cell has a maximum charge current of 5A so will this be appropriate? This charger i have my eye on is capable of CC/CV but i want to make sure it is suitable before purchase
 

ajw22

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Joined
Nov 16, 2018
Messages
576
The 15A current will get split 14 ways, so each cell get charged at just 1.07Amps. Perfectly fine if they can handle 5A.
Empty to about 80% charge should go full speed and take about 1.6hours. After that the charge current starts to slow down, so full charge will probably take 2.5h~3.0h or so.

The more important question: is the voltage correct?
Also, is there a system in place to prevent any cell from getting charged above a safe voltage? Could be a BMS, or a charger with monitoring/balancing leads. Without that you risk having the battery catch fire.
Also, in your case you might want to consider a BMS/charger with cell temperature monitoring. Many cell manufacturers specify that cells should only be fast charged between 5C~45C, and slow or even not at all outside of that range.

In the future, it's always better to post all the details you have: what project it's for, exact model of cells, link to your potential purchase, etc. Context often matters.
 

rexgoodwin

New member
Joined
Mar 12, 2021
Messages
29
The 15A current will get split 14 ways, so each cell get charged at just 1.07Amps. Perfectly fine if they can handle 5A.
Empty to about 80% charge should go full speed and take about 1.6hours. After that the charge current starts to slow down, so full charge will probably take 2.5h~3.0h or so.

The more important question: is the voltage correct?
Also, is there a system in place to prevent any cell from getting charged above a safe voltage? Could be a BMS, or a charger with monitoring/balancing leads. Without that you risk having the battery catch fire.
Also, in your case you might want to consider a BMS/charger with cell temperature monitoring. Many cell manufacturers specify that cells should only be fast charged between 5C~45C, and slow or even not at all outside of that range.

In the future, it's always better to post all the details you have: what project it's for, exact model of cells, link to your potential purchase, etc. Context often matters.
Oh yes I have a BMS connected to the module and tested it, it works. The voltage of the charger matches the voltage of the battery yes I was just curious about how current is distributed among cells; where it is dividing the current by the total number of cells or by the number of cells in parallel

That makes sense apologies, next time I will be detailed as possible.
 
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