cwah wrote:Yeah, but the BMS is on the NMC side.
Without BMC the NMC battery would have higher volumetric density. They're also cheaper.
I'm just wondering how that extra payment on the lipo worth it. They zippy compact haven't been tested by a members. Maybe it has very short cycle/calendar life.
Most BMSes are well under 1lb. When you're talking about a 20AH, 48V pack, the cells are the majority of the weight. Have you ever picked up a BMS before?
The cycle/calendar life of the NMC is also unproven. I think they claim 500 cycles, but with a BMS that kills 1-2 cells in a short period of time, and the fact that the pack comes with unmatched cells, how many cycles do you really think you're gonna get out the entire pack? not much... and when a cell dies, where are you going to get a replacement? I don't see replacement cells on BMSBattery's site.
You don't necessarily need zippy compact. Even Turnigy 20C is good in terms of density.
People have stretched the turnigy and zippy batteries to 600 cycles..
But if cycles are what you want, you want lifepo4. That's at the expense of your energy density, but it is a greater value, for sure!