Li-Ion 3S3P charging

[nskii]

Hi. Im working on a battery bank idea for a boombox project. I can get few dozens of industrial 18650 li-ion cells for free and the idea was to have three pararell strings of 3 cells wired in serial in each string. I hope that was clear. So 12,6V per string x3 in parallel. That would give me x3 the capacity right?

But I can't figure how to charge these cells since they would be integrated into the box. I found this protection board on eBay and if i were to wire 3 pcbs with each string could I just bring the power supply onto them and start charging?

Cheers, Nino

 

[breenconfed]

I've seen a few vids online and they use balance leads with a charge balancer for the cells.

Here's a vid wherew the guy shows the balancer he uses for a diy battery he made for his ebike.

https://www.youtube.com/watch?v=1e_gj4dASl0

hope it helps.

 

[nskii]

But the protection board I linked basically does the same thing since each cell is connected to the board, or?

 

[breenconfed]

When messing with Li Ion I'd rather go the lazy route as i don't fancy one exploding on me :/

anyway i found you some extra info on this site, scroll down to the first review, I don't have enough info myself but i do know Li Ions can explode if great care isn't used.

Anyway here's the site, it a selling site but i link it for the review that one guy gives, it may give you some help in deciding.

Protection Circuit Module (PCB) for 14.8V Li-Ion Battery Pack (5A limit ) with Fuel Gauge Socket

 

[nskii]

Indeed. Li-Ion and especially LiPos are well know for catching fire when care is not taken into consideration. I think I'll stick with my primary idea using with SLA.

Thank you for your inputs!