I completed the 5-amp discharge testing of my e-max pack. The scooter had about 4750 km on it. Range was down to 12 miles and falling rapidly.
Here are the results, with a test on one of my new BB EB20-12's included for comparison:
The ampere-hours for the silicone batteries when discharged down to 9.5 volts under load, ranged from 6.1 to 15.4. The new BB battery got 17.6 AH - exactly what the manufacturer data sheet reports for for a 5 amp rate.
As you can see, the performance of the silicone batteries was _very_ inconsistent. The best silicone battery is down to about 85% of the new BB battery capacity at about 200 cycles. The BB battery data sheet, if it is to believed, shows that the BB battery will still be at 100% (down from 104% after break-in) at 200 cycles.
Besides the two batteries that were pretty much completely shot, a premature, continuous, voltage sag is characteristic of the rest of the silicone batteries. A hint to what is going on is apparent from my measurements of the voltage the battery recovers to when the load is removed - the worst battery (3A) recovered to 12.7 volts, the best (1A, 1B and 2B) to 11.9 to 12.0 volts, and the new BB to 11.3 volts. There was a lot of energy still left in the silicone batteries, but internal resistance rises too high, as the battery is discharged, for it to be usable.
I believe I have the highest mileage on my (first) e-max (2950 miles/4760 km) than any other owner who participates in this forum, and this mediocre performance represents the best performance of any e-max battery pack among these e-max owners. Most new e-max's were delivered new with at least a couple bad batteries. And most of the rest encountered battery problems within the first 1000 km of use.
In conclusion, the Guineng "silicone" batteries appear to be just another bottle of Chinese snake oil. Their performance is no better, and possibly worse, than good quality, but still considerably cheaper VRLA batteries.
Considering the best mileage I ever got on the silicone batteries was 28 miles, I look forward to getting record mileage (better than 35?) on my new BB battery pack - as soon as winter lets up a bit.
I welcome any comments!