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October 04, 2007



You're right.  This is another game-changer.

I checked the price of deep-cycle batteries at the auto store recently, and found them to be around $70 for something like the 105 AH unit I bought a few years ago.  This is about $56/kWh of capacity.  If 80% of this is usable and the battery can operate for 1000 cycles before replacement, the cost of putting energy through the battery is about 7¢/kWh.  Adding perhaps 8¢/kWh for off-peak charging and dividing by 80% battery efficiency, the total cost of energy at the terminals would be 17¢/kWh.

Put this into a PHEV consuming 300 WH/mile and the energy cost is 5.1¢/mile, including all depreciation (but not interest).  To beat that with $3.00/gallon gas, you'd need to get nearly 60 MPG.  Firefly Energy can bring the PHEV to the masses.

Nick G

E-P, I agree on the importance of this battery. Unfortunately, Firefly estimates the cost at $100-$150 per KWH, so the costs will be a bit higher than your estimate.

Still, 4x the performance at 2x the price is a big improvement. Plus, I suspect that PHEV's would get better cycle life than 1000 cycles, because of much better charge & temp management than in lawn tractors or trucks. Also, I thing 8 cents for off-peak is a bit high: check out www.thewattspot.com


“In trucking, this means our battery can be expected to last three to five times longer than the best performing valve regulated lead acid batteries.”
---three to five times----
Do you test it? I am a R&D Engeneer of lead acid battery(VRLA-GEL,TUBLAR-TRACTION).I master the VRLA battery performance and design!!It's impossible!!!


can be expected to last three to five times longer than the best performing valve regulated lead acid batteries

Trucking Software

I think this wil change somewway trucking business is done. Using more and moree new softeares really has helped these days. We have introduced MAsslogocs and trucking software that is really working for us. Get it at http://www.masslogics.com

Trucking Software

This battery seems to be a really great seeing the characteristics above. Its really different on an ordinary battery

Trucking Gyan

Good move from Firefly.
Nick, please go ahead and explain why is it impossible to give long life than other batteries?

Truck Fleet Training

Nick, Looking forward to hear from you as response for Trucking Dude's query.

Truck Bed Covers

Good information about producing this truck battery. I hope Firefly produces a similar battery for cars, too.

Made in China

Made in China

7ah Battery

Great post, really well thought out and written. I'll look out for more of your posts.

buy viagra

the firefly are interesting animals. they usually goes close to rivers and the stop on some rocks besides the water.

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Batteries/Hybrid Vehicles