Home
Why NiZn?
Cooling System
Batts in the Car
On the Road!
Hart Balancer BMS
To do list
Miscellaneous
June 2004 fire...ugh
An Evercel NiZn transplant
Why NiZn?

Because NiZn appears to hold more kwh per pound of battery and advertises more cycles per battery. The MB80's I bought at $270 each weigh ~36.4 pounds.  Nameplate rating is for 64 Amp Hours.  (see: http://www.evercel.com/manufacturing.html)   The Optima Yellow Tops I purchased here in Connecticut were $189 less a core charge of $10.  The YT's have a nameplate rating of 55 Amp Hours at the c/20 rate and the spec sheet says they weigh 43.8 pounds.
 
A discharge cycle graph on my battery cycler show what we've got:
 
 

discharge4-3.jpg

The purple line shows that the battery delivered about 70AmpHours down to the recommended cut off of 9.6volts.  The yellow line shows a ~20amp discharge rate.  The dark blue line shows the case temp getting up to about 35 dgrees C, but cooling down quickly after the discharge stopped.
 
I like getting more than the nameplate out of a battery.  I like having almost 1kwh in this small package!