Load testing

These are B&B Batteries EVP Series "For High Power, High Cycle Use." They are used on the Ego, and I have them on my KZ750 motorcycle conversion.

Spec Sheet

I load tested 6 batteries before they were used. This was about 1 yr 6 mos after purchase.

Format is battery No., Open Circuit, voltage at 200 amp load, and power

B1, 12.82v, 10.49v, 2098 watts
B2, 12.67v, 10.55v, 2110 watts
B3, 12.65v, 10.54v, 2108 watts
B4, 12.65v, 10.35v, 2070 watts
B5, 12.70v, 10.40v, 2080 watts
B6, 12.69v, 10.38v, 2076 watts

Open Circuit Avg: 12.7v
200A Average: 10.44v
Power avg: 2090 watts
 

Repeated the load test today at 200A. The batteries now have been cycled a few times. Couldn't get an accurate open circuit voltage because the powercheqs are shuffling power around as I do the test.

B1, 10.67, 2134 watts
B2, 10.67, 2134 watts
B3, 10.81, 2162 watts
B4, 10.83, 2166 watts
B5, 10.76, 2152 watts
B6, 10.78, 2156 watts

200A Average: 10.75
Power Avg: 2151 about 3% increase

I feel that with the proper BMS these 6-cell R/C batteries would work great for a large pack in a motorcycle or bicycle/scooter. The problem is constructing a BMS. As you can see below, they can deliver quite a punch.

This is for the 7.2v R/C batteries available from batteryspace. I did some load testing...

"Powerizer" NiMH R/C 6-cell 7.2v 3000 mAh (not available anymore)
similar to: http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=1298

Note: After connector cut off. Fast charged at 2 amps for a few minutes.

Open Circuit: 7.8
30 amps: 5.83v - 174.9 watts
50 amps: 5.10v - 255 watts
75 amps: 3.174v - 238.05 watts
 

"Powerizer" NiCad R/C 6-cell 7.2v 1700 mAh Battery No. 1
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=89
Supposed to have "sintered" electrode which should lower internal resistance.
Note: After connector cut off. Battery was overcharged at 250 mA for <24 hrs

Open Circuit: 8.41
30 amps: 6.5 - 195 watts
50 amps: 5.42 - 271 watts
80 amps: 3.61 - 288.8 watts
 

"Powerizer" NiCad R/C 6-cell 7.2v 1700 mAh Battery No. 2
Note: After connector cut off. Battery was not overcharged, but charged at 250 mA for 7.0 hrs.

Open Circuit: 8.47
30 amps: 6.61 - 198.3 watts
50 amps: 5.53 - 276.5 watts
80 amps: 3.75 - 300 watts