Thx proto,

I'll have to study this some more. Did you go thru the volume numbers?? Will all those batteries fit in the space allotted within the frame??. Also 2.2 ah doesn't seem that good of an energy density. The original Tesla roadster batts were 2.2 of course if we can go 100% DOD that makes a big diff. and 1000 cycles is that good?? at once a day that's only 2.7 yrs.

GSB

Bear in mind that's 1000 complete cycles - 2000 50 to 100% discharge/charge cycles causes roughly as much wear as 1000 0 to 100% cycles. 1000 cycles at 100% DOD is 60k miles** for the Empulse 6.0, 100k** miles for the 10.0. 100k miles of riding in 2.7 years would be an impressive feat!

** your mileage will vary

Life cycle performance is negatively impacted by a number of factors:

* higher temperature during charge or discharge

* higher rates of charge or discharge

* increasing age of the battery

For example, the

Valence packs used in the Enertia are tested in the lab for 1600 cycles @ 45°C, 2600 cycles @ 23°C with a 0.5c charge/discharge. The "C" rating for battery charge/discharge is rated in multiples of the battery's amp-hour rating, for example a 3.7v 2.2ah discharging at 0.5c is 1.1a. Similarly, a 3.08kwh enertia pack discharging at 0.5c is 1.54 kw.

Note above that battery life is typically tested to 80% capacity. So after 1000+ nominal cycles on the Empulse, you should have around 80% of your original capacity remaining. 80 miles on an Empulse 10.0, 48 miles on an Empulse 6.0. You can continue to use the bike with the diminished range, or you can replace the packs. The older reduced capacity packs can be recycled or used for fixed energy storage, where decreased specific energy isn't hugely important.

The Tesla Roadster is a good point of comparison. The Roadster pack is 99S 69P, for a total of 6831 cells (vs 1200 similar-size cells in the empulse 10.0). The Roadster's cells are rated at 3.79v and 2.23 ah, so they are very similar in size and capacity to the Leyden Energy cells.

The big difference is weight; I haven't seen quotes for the Roadster individual cell weights, but the complete pack weighs in at 900 lbs. Counting packaging, each cell averages out at 60g, vs 43g for the Leyden Energy cells sans packaging. I don't have any feel for much weight the packaging adds.

The Roadster's battery is pack is also rated to 50k miles @ 70% remaining capacity (see, that's cheating

. At roughly 250 miles/cycle, that's only 200 complete cycles, and probably 130-150 cycles @ 80% remaining capacity. It's not fair to compare cycle counts without knowing the test temperature or the charge/discharge rate, but it seems the batteries in the Empulse and the Enertia will hold up better.