Can I use a 3S2P configuration with Battery Protection Board? Please see image

Thread Starter

pmap93

Joined Aug 15, 2016
15
hello and good day!

I'm in the last stage of the project in my little portable speaker. But I'm having doubts with the Battery Protection Board.

Power Electronics make me nervous, especially with Lithium ion.

The board claims it's only for a 3S 18650 (or similar voltage) battery. But I want to double the mAH (capacity), so I decided to use 3S2P configuration. My question is, is it safe? Will it have problems?

The Batteries I'm planning use are the Panasonic NCR18650B.
(Which I'm guessing is having it's own protection already, better safe than sorry):



This is the wiring I was planning:


VERSUS the original from eBay:



I hope it's clear, and i hope for someone to reply soon :)

Regards,
Paolo
 

ian field

Joined Oct 27, 2012
6,539
hello and good day!

I'm in the last stage of the project in my little portable speaker. But I'm having doubts with the Battery Protection Board.

Power Electronics make me nervous, especially with Lithium ion.

The board claims it's only for a 3S 18650 (or similar voltage) battery. But I want to double the mAH (capacity), so I decided to use 3S2P configuration. My question is, is it safe? Will it have problems?

The Batteries I'm planning use are the Panasonic NCR18650B.
(Which I'm guessing is having it's own protection already, better safe than sorry):



This is the wiring I was planning:


VERSUS the original from eBay:



I hope it's clear, and i hope for someone to reply soon :)

Regards,
Paolo
2P, 3P and sometimes even 4P turn up in laptop packs, its simply how they end up with the sum of the capacities without huge bulky cylindrical packs.

Just make sure your controller module is rated for the Ah capacity you end up with.
 

ian field

Joined Oct 27, 2012
6,539
Hello and thank you for your answer!

Just to be clear, the charging controller is an IC on the board? If so, which one? Can you please direct it to me?

This is the board
https://www.ebay.com/itm/321779081018

It doesn't show much information about its mAh Rating.
Its advertised as an 18650 guard plate - typical capacities are usually somewhere in the general direction of 2200mAh.

If you want to protect higher than that - buy something that's advertised to do so.
 

Thread Starter

pmap93

Joined Aug 15, 2016
15
Can I buy TWO of these and have to separate 3S packs and connect them in Parallel?

|==Batt]=[Batt]=[Batt]==[Protection Board]===|
| --------------------------------------------------------|
|==[Batt]=[Batt]=[Batt]==[Protection Board]===|

|
---------------------------------------------------------|
[GND]------------------------------------[Output of around 12V]
 

ian field

Joined Oct 27, 2012
6,539
Can I buy TWO of these and have to separate 3S packs and connect them in Parallel?

|==Batt]=[Batt]=[Batt]==[Protection Board]===|
| --------------------------------------------------------|
|==[Batt]=[Batt]=[Batt]==[Protection Board]===|

|
---------------------------------------------------------|
[GND]------------------------------------[Output of around 12V]
I'd contact the manufacturer and ask - but my gut says its not advisable.
 

Thread Starter

pmap93

Joined Aug 15, 2016
15
Thanks very Much.

I'll avoid eBay for now and look for more reputable resellers of Battery Protection modules
 

ian field

Joined Oct 27, 2012
6,539
Thanks very Much.

I'll avoid eBay for now and look for more reputable resellers of Battery Protection modules
Lithium cells are very high energy density - if it gets out all at once, you'll have a fire on your hands.

Its best not to take chances, at least till you know which ones are calculated risks.
 
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