Also depends on the C rate (and appropriate voltage sag).
The best way is to figure out your max Ah available by going from full to LVC just ONCE.
THEN, figure out 90% and never use more than that for the longest possible cell life.
Like I said before...
My best battery life so far has been the 15AH lifepo4 that I've had for 2.5 years and over 1000 cycles and I still have a usuable 14ah out of 15 or 93% capacity.
~15% less than 20% depth
~75% between 20% and 80% depth
~10% more than 80% (and 25% of that is to LVC of 2.5v - 2.7v)
Also of note, my controller pulls 25a MAX (1.6c) and I usually cruise at about 10a (.7c) and my battery is rated for 1C continuous and 2C max.
I also know, that once I start getting close to the 14ah, I can notice the slightly higher sag on the battery and that's when I stop using it.
Now mind you, I almost never use 14ah, BUT I constantly use 13AH..
(For me, 14AH is about 19-20 miles and 13AH is 17-18 miles)
Once I "break in" the new 36v 20ah, I will charge it fully and then once I get close to 19AH I will take it "easy" on the battery with a max amp pull of 5a (C/4) until I hit LVC. That will give me the max range I'm able to get. And will ride accordingly..
I will let you all know the "capacity" of this batt.
(P.S. Sunnyday, have you tested your max range yet or total AH capacity of yours yet?)
Last edited by Sangesf; 04-28-11 at 10:30 PM.