Help selecting cells for Gouach battery, please

[offGridDownUnder]

I'm a backer, and I've been notified my casing will ship soon. I backed a 48V case + cells, but presumably due to the bizzarro world we find ourselves in, I'm told I'll receive the case and must source the cells myself. Links are provided to several sources in Europe and the United States. I am in Australia.

For reference about the specifications, this page gives the recommended cell sources: Cells suppliers

I've checked several, and I don't see shipping to Australia, so no go. Within Australia, we have a very good supplier here: Lithium Battery Cells #1 Rechargeable eBike Batteries

As I post this, there are two entries which match 18650. How would I go about deciding which is better for my use? The gouach supplied choices highlight some as their recommendation, which can give some clues, but I don't know what is the basis for choice.

As much 'why' as possible would be appreciated - I do want to learn. This happens to be the next pool I'm being thrown into.

The target machine uses a Baserunner (or I could swap in a Phaserunner) and a v3 All-Axle rear. The current battery is a 48V 20Ah Cap Rouge cell. Given I paid for cells and won't get them I may have some credit, and buying a 36V insert may be a way to use that up, so discussion of 36V vs 48V won't go amiss either in your comments about how to decide "best cells".

 

[slaphappygamer]

The chart on the product page has really good info.



The max number of cells is 40. So there can only be 10S4P or 13S3P. With a 36v battery, you can go 20-22 mph max. The 48v battery can go about 25-28 mph max. Typically, more parallel groups equal more range. In this case, the number of cells are the same (whether 36 or 48 volts) and the capacity will be the same. Though I think having a slower max speed, with a 36v battery, would help reserve energy for more range.

Since you've already used a 48v battery, you know what to expect as far as top speed is concerned. Unless you like going fast, going to 36 volts MAY be a hard move.

 

[lnanek]

Max amps matters too, though. My fat tire bike needs 35A to go 30mph, so trying to go that fast on a BMS only rated for 25A would usually just trip the BMS' protections and turn off the bike.

I actually paid to reserve a Gouach as well, but haven't bothered getting it due to this. I'd have to get two and put them in parallel.