amberwolf wrote:If you don't mind the extra work of first cycling and verifying all of your packs/cells, and either repairing or tossing any that don't work as expected, and then paralleling several packs for each of several sets, and then seriesing those sets together for the voltage you want, RC LiPo can also do what you want well enough. Methods' LVC/HVC setup can also be used with these (it is in fact designed for them, including being made to parallel the packs for you). Then just like the other packs, you can bulk charge, periodically check cell balance, and top off any low groups with a single-cell charger.
Chalo wrote:So I am in the market for a decent battery and charger of nominally 48V, to drive an X5305 hub by way of a Crystalyte 35A controller. ... I can build my own pack if that saves money or avoids quality issues, but I'd rather not have to design my own pack configuration.
I understood that the 20ah pack are something like 132wh/kg so that's quite good because you can do 100% DOD with them.
dogman wrote:Big motor, big controller, pingbattery = shorter than expected lifespan.
Cellman 20 ah pouch pack for the win, unless, the wife will ride like my wife. At 15 mph max, My wife could easily make the 11 ah round cell triangle pack from Cellman last the 20 miles.
I suppose you could return a pack to Cellman if you weren't satisfied with it, but only an idiot mails a pack back to china for a warantee issue. It's cost prohibitive. I'm quite sure you will recieve 16 tested and good cells in the pack, which leaves only getting a charger or bms replaced as the possibilites. Too easy for Cellman to send you new ones if needed, which they won't be anyway.
cwah wrote:I understood that the 20ah pack are something like 132wh/kg so that's quite good because you can do 100% DOD with them.
SamTexas wrote:cwah wrote:I understood that the 20ah pack are something like 132wh/kg so that's quite good because you can do 100% DOD with them.
What do the capacity (20ah) and the energy density (132wh/kg) have to do with 100% DOD? NOTHING! You really need to slow down and get the basics well understood first.
999zip999 wrote:Cellman say's he checks his cells before assembaly and it's plug and play not a hobby battery remenber you can't just run to the store for parts.
lcrewse wrote:Check the for sale section, http://endless-sphere.com/forums/viewtopic.php?f=9&t=39215
I'm selling this battery that meets all your criteria. Will easily handle the 35a. Tested at 30mph (about 1000 watt draw) it delivers about 30 miles of range.
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