Diy battery 18650 pack or buy one?

On paper - yes
In real life - i doubt

Anyway, specs say 22000, but later its called nominal 16000
Maybe these packs have 10000 If you have luck :joy:

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one picture also say 2200mah

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haha yes I did notice all of this - I’[ve asked the question regardless as Alibaba can hold them to it. Weight is about right tho so I figured its worth the as right?

No way 22.000 20C
Usual 20.000 12c are bigger & heavier

Its for sure a monypit.
But hey, give it a try, prove me wrong.

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what about this type? 4 pieces 44V 20Ah?

what do you think?

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Can anyone using the Malectrics Spot welder powered by a 3s lipo recommend best pulse duration settings for welding 0.15 pure nickel to 18650 batteries.

I found it depended on the battery charge. If I remember correctly on full charge I used 15ms and on and empty battery I used 20ms. I pretty much just adjusted it accordingly.

It depends on the C rating max , 480A : 15ms , 780A : 9ms
You may have to test as long as you go on 2 nickel strip , when voltage decrease time will need be increased , it is not energy regulated

Test on 2 x 0,15 nickel strip , so you don’t make a hole , 18650 terminal’s are ticker

Thank you @Jezza and @Alexandre
I appreciate your help.
Cheers

Hey, can you tell me what BMS you used for 14S charge only?

I used one from amazon, cost around 30€

I use this one because you can control al parameters with your phone. At first I wanted to use it for discharge also but it is kind of big, so I use it for charging only and made a balance connector on my 14s11p battery.

#Aliexpress € 67,59 21%OFF | Smart 8 S-24 S bms lithium Batterij bescherming Boord Bluetooth APP Lifepo4 li-ion 10 S 13 S 14 S 16 S 20 S 70A/100A/150A/200A/300A
https://a.aliexpress.com/_d7SJUBw

Nice! Any pictures of the setup?!?

This is my battery, also with 4 ntc’s for temperature measurement. I can take a picture of charging tomorrow.

Nice and neat infairness to you! Ya a pic of the charging setup would be great!

This is my charge setup. I connect battery negative to bms. Battery positive and bms negative to charger. Balance and temperature connector are also connected to bms.

Thanks, so your BMS is purely part of your Charger and not on the board at all?

That is correct, because it takes to much space in my box.

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