Suggestion for 48v 10-15ah battery
- Thread starter Justin34
- Start date
George S.
Well-Known Member
Try to find a kit with a battery. You get some sort of package price and more of a plug and play experience. The battery packs seem to be 1) high end, top notch cells or 2) something older, lower capacity, or somewhat dubious in origin. You absolutely have to ask.
I was looking at these yesterday:
http://www.aliexpress.com
I know nothing about this company, but let's say you could get these 'name' cells for $3 apiece. To make a 48v 11AH battery, you need to join all the cells in series and then in parallel. You may be able to get the cells 'tabbed', or prepped in some way. You'd need 65 cells for the 48v 11A. That's $200 and a nice 'project'. You can find YouTube videos about how to do this stuff. You need balance leads, which gets a little annoying with 65 cells. I'm sure everyone on YouTube has some kind of engineering degree, right? You need a reasonable case. Can you find something like this 'ready to fly'?
You see packs all the time on Ebay, and some of the vendors have good ratings. People don't come back a year later and tell you if it all worked out, on Ebay.
It's important to understand that ebikes, especially kits, are a cottage industry. There's not enough volume, anywhere, to get the advantages of mass production.
The best solution would be what NTS is working on, a battery case where you more or less plug the cells in, and they are mechanically joined to form electric circuits. Who knows what that will cost.
You will find lots of (endless) discussions on Endless Sphere, but if you just want to buy something you have the kit vendors, Ebay, and something like Alibaba. Dig around.
I was looking at these yesterday:
http://www.aliexpress.com
I know nothing about this company, but let's say you could get these 'name' cells for $3 apiece. To make a 48v 11AH battery, you need to join all the cells in series and then in parallel. You may be able to get the cells 'tabbed', or prepped in some way. You'd need 65 cells for the 48v 11A. That's $200 and a nice 'project'. You can find YouTube videos about how to do this stuff. You need balance leads, which gets a little annoying with 65 cells. I'm sure everyone on YouTube has some kind of engineering degree, right? You need a reasonable case. Can you find something like this 'ready to fly'?
You see packs all the time on Ebay, and some of the vendors have good ratings. People don't come back a year later and tell you if it all worked out, on Ebay.
It's important to understand that ebikes, especially kits, are a cottage industry. There's not enough volume, anywhere, to get the advantages of mass production.
The best solution would be what NTS is working on, a battery case where you more or less plug the cells in, and they are mechanically joined to form electric circuits. Who knows what that will cost.
You will find lots of (endless) discussions on Endless Sphere, but if you just want to buy something you have the kit vendors, Ebay, and something like Alibaba. Dig around.
Cameron Newland
Well-Known Member
Those cells seem a bit strange...aren't quality 18650 cells pushing out 2900-3400mAh nowadays, not 2000mAh like those Samsungs? I know that the Panasonic NCR18650B's are pushing out 3400mAh. I'm currently sitting on 50 NCR18650As and 12 NCR18650Bs in my attempts to put together a custom-built battery pack w/ BMS. Haven't really gotten anything assembled yet, though, as I need to learn more about battery configuration/construction first. They cost me about $8/cell.
George S.
Well-Known Member
Sure, $3 versus $8. Older design, might be stale cells, might be a production line they keep running. Obviously, high capacity cells are newer and much higher priced. (Price per watt.) Just a question of finding a reasonable compromise or price. Must admit that since NiMH I have no experience making packs, doubt I would try.
The pack you seem to be building might last 5 years, especially if you 'overbuild' and don't run it down, give yourself 'extra' capacity that will be lost with the cycles. If I could buy a $300 pack and get 300 cycles out of it, that's a dollar a 'ride' and just fine.
The pack you seem to be building might last 5 years, especially if you 'overbuild' and don't run it down, give yourself 'extra' capacity that will be lost with the cycles. If I could buy a $300 pack and get 300 cycles out of it, that's a dollar a 'ride' and just fine.
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