1. The Enertia uses Valence LiFePO4 batteries. Details on the Enertia Plus batteries haven't been announced yet, so it's hard to say anything about the battery performance. Hopefully we will get more information at EICMA this month.
Phantom has ridden his Enertia in temperatures at least
down to the 20s. BrammoBrian (Brammo product development director) claims
the lower operating temperature of the Enertia batteries is -10°C / 14°F.
Lead acid definitely takes a hit to performance in the cold. Temperature impact is heavily dependent upon the battery chemistry; I believe the Valence Ucharge batteries in the Enertia are rated for 65% capacity at -10°C. Honda uses Toshiba SCiB batteries in their
Honda EV-neo scooter that are rated at 95% capacity at -10°C, 85% capacity at -30°C.
The Enertia Plus
will have a 12V accessory plug on the handlebar.
2. The Enertia Plus' top speed has yet to be announced, but the Enertia tops out right around 60 mph.
Brammo claims 40 miles highway OR 80 miles city (~25 mph) for the Enertia Plus. The Enertia Plus can probably handle work + Y, but not work + Y + errands without intermediate charging. If you CAN charge at a 120V plug for a few hours after lunch/errands, then I think you would be okay.
Zero has a pretty good website
covering range in real-world conditions on their 2010 Zero S (3.9 kwh). Not 100% comparable, but add about 50% to their range and you'll be in the ballpark.
Keep in mind that range will be reduced somewhat in the cold. How much? We don't know yet.3. I believe Brammo has sold somewhere around 300-500 Enertias. I'd love to see a sales tally as well.
4. Generally speaking, lithium batteries linearly degrade based on time, cycle count, and discharge/charge conditions. Brammo claims 1000 cycles to 80% capacity; the 80% figure is just convention, in actual usage you may make it out to 2000 cycles (60% capacity = 48 city miles OR 24 highway miles) or beyond. Basically you can keep using the bike as long as the range is acceptable; commuting on non-Y days or similar.
I would guesstimate battery replacement costs for the Enertia Plus to run around $4-5k today, certainly not $7k for a $9k bike. In 3-5 years the battery replacement costs should be less, or a higher capacity battery may be available. Brammo has indicated they would like
I'll admit that I don't find the above explanation terribly satisfying; I'd love to see Brammo offer a pro-rated battery replacement plan similar to the Tesla's plan for the Roadster.
Here are a few other things to consider:
* Maintenance for the electric bikes should be near-zero other than brakes, chain and batteries.
* We don't know what gas prices will look like in 3-5 years. At 50-60 mpg your bikes do pretty well here anyhow.
* 1000 charge cycles is 1000 full cycles or 2000 50% charge cycles. Generally mileage is a better indication of wear than variable charge count. 1000 full cycles should get you around 40k miles highway or 80k miles city on the Enertia Plus.
Bonus: Speaking generally, the Enertia is somewhere between a 125c and a 250cc bike. The Enertia Plus should be a bit faster; the 3.1 kwh Valence pack is rated at peak 3C discharge (9.3 kw), but the Enertia motor is rated at 13kw peak.