Want to make a Xootr eX3 pack. Which cell and BMS?

[rsilvers]

My Xootr probably died over 13 years ago, but now I want to make a pack for it.

I have room for four banks of 6 or 7 cells.

This is a 24 volt motor. Should I use 6 or 7 18650s per bank?

If I use a BMS, will it see every cell or just every bank? I am asking if the cells should also be IC protected in addition to the BMS.

I may also want to make a pack for an XSkate. That would take 35 cells (5 banks of 7). I weighed the old lead-acid batteries and they are 32 lbs. I will save 28 lbs using 18650s.

Which BMS do I need?

For cells....

I see Lunacycle has LG and Samsung for $4.05 and $4.54 each in 50 packs. As far as I can tell, that is the best deal out there in terms of dollars per Ah (real Ah, not BS Ah), including Amazon and eBay. Is that the case? If so, which of their three battery offerings are best for these applications?

Thank you.

 

[Nobuo]

My Xootr probably died over 13 years ago, but now I want to make a pack for it.

I have room for four banks of 6 or 7 cells.

This is a 24 volt motor. Should I use 6 or 7 18650s per bank?

If I use a BMS, will it see every cell or just every bank? I am asking if the cells should also be IC protected in addition to the BMS.

I may also want to make a pack for an XSkate. That would take 35 cells (5 banks of 7). I weighed the old lead-acid batteries and they are 32 lbs. I will save 28 lbs using 18650s.

Which BMS do I need?

For cells....

I see Lunacycle has LG and Samsung for $4.05 and $4.54 each in 50 packs. As far as I can tell, that is the best deal out there in terms of dollars per Ah (real Ah, not BS Ah), including Amazon and eBay. Is that the case? If so, which of their three battery offerings are best for these applications?

Thank you.

If each series of each bank is paralleled with other banks together, they are electrically balanced, and the BMS will read that paralleled group as one cell (all has always same voltage while paralleled)

you can use 6s, but the standard in lithium-ion is 7s for 24V. just need a 7s BMS and one that fit your discharge ratings, that's all