Some Ebike Battery Porn - A few builds

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Ebikeforlife

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Joined
Jan 6, 2021
Messages
36
As a new member, just adding a few ebike packs that have been built over last few months.. i was asked to start taking photos of builds but i usually forget so here are a few
 

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DiggsUt

Member
Joined
Oct 30, 2019
Messages
65
Since you have built quite a few packs I assume you are building packs for others. I've been asked to do the same but so far stayed away from building them for anyone other than family members. I'm worried about the liability of something failing and garage/house catching fire.
 

Ebikeforlife

Member
Joined
Jan 6, 2021
Messages
36
Since you have built quite a few packs I assume you are building packs for others. I've been asked to do the same but so far stayed away from building them for anyone other than family members. I'm worried about the liability of something failing and garage/house catching fire.
Yes i build for others, As long as you build your packs to be as safe as possible then thats all you can do.... You cant stop people being stupid.
 

Blackgolem

New member
Joined
May 18, 2021
Messages
7
As a new member, just adding a few ebike packs that have been built over last few months.. i was asked to start taking photos of builds but i usually forget so here are a few
Dude is there an easy simple way to find what the capacity is of a cell without a tester? purchased a 48v 13s3p claiming 28000mah (I know, I know) should I assume because there's np print on cells that these are actually 2.8 ah cells
 

italianuser

Active member
Joined
Feb 25, 2020
Messages
296
Dude is there an easy simple way to find what the capacity is of a cell without a tester? purchased a 48v 13s3p claiming 28000mah (I know, I know) should I assume because there's np print on cells that these are actually 2.8 ah cells
I suppose you can get an approximate measure using a light bulb, for e.g. a car light bulb. I have a set of 55W 12V(*) (standard H4 or H7 car bulbs) and used them in these cases; you could put 4 in series, they should divide voltage between them, and expect them to sum up to a usage of 220Wh. You battery is 48V x 28Ah = 1344Wh. So light bulbs should stay lit for 1344 / 220 = 6.1 hours.

(*) I know they are 55W bulbs because it's written on them! Plus the value was confirmed in the tests I did using them, well, with a 5% error.
 

Simon2021

New member
Joined
Feb 7, 2021
Messages
8
Do you buy the BMS from the manufacturer and integrate them in your pack?
Are the packs used in commercial ebikes?
 
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