It has been a little bit, but Molicel recently announced the P45B cell, the next Generation of the P42A li-ion cell that the SP140 currently uses.
The new Cell has 7-9% higher capacity(depending on who you ask), 22-33% lower internal resistance(depending on who tested it), faster charge times, less heat build up, and longer run time at all discharge levels than the older P42A. This will improve our flight times by about 5 minutes. This is the future 
No leaps and bounds battery tech yet eh?
Still good news.
7% more capacity, if it maintains the same C rate, is a huge jump!
This cell was brought up and discussed here on the forum back in March.
New battery option: better power density! - #81 by kubark42.
Unfortunately, it has failed to materialize in actual production. I had heard an initial release date of July or August from the E-skate / DIY onewheel forums who are also interested in higher performance cells.
But August has came and went with no sellers carrying or able to order the cell.
I even called Li-Ion Wholsale and they said they are not able to order the cell from Molicel and they can get just about anything.
Alibaba appears to have some cells claiming to be P45B’s, for a whopping 11$ a cell!
The real advantage of this cell wasn’t it’s 7% more capacity which doesn’t translate to much increase realistic range. But the reduced cell impedance.
With these cells the 6P feather pack would really shine! You could use full power for longer and not overheat the pack. Less heat in the pack means more energy out of the motor. So the smaller packs would benefit the most for using this cell. A 4P Ultra-light feather pack could even be possible.
If anyone sees or hears of these cells for sale, message me or post a link here. I will totally buy some to make a pack and see if this is worth the hype.
You have Samsung 50S they are 5Ah and 10.5mOhm.
While a Samsung 40T has 8,5mOhm
Dont know what Molicel has.
the molicel 5000 mah INR-21700-P50B is comming 
It could be that the EPPG will soon become too light and we will need smaller wings…
BetaVolt’s BV100
This is tiny radioactive battery that can last 50 years without recharging — and it’s coming in 2025. BetaVolt’s BV100 is smaller than a coin and contains a radioactive isotope of nickel that decays into copper and supplies power to a device for up to 50 years. The battery emits energy by utilizing a decaying radioactive isotope of nickel (Ni-63). Between the layers of Ni-63 are sheets of a single-crystal diamond semi-conductor that are just 10 microns thick. The battery measures 151515 millimeters with 100 microwatts of power and 3 volts of voltage. Interestingly, with this capacity, which is quite low, it is not strong enough to charge an electronic device like a smartphone. Hence, the company suggests using BV100 in series or parallel combinations to power devices. https://youtu.be/AjhJlpqNWF0(https://youtu.be/AjhJlpqNWF0)
Unfortunately, an 18kg battery made of 6,000 of the BV100 cells would only make 0.6 watts.
Can someone clarify what makes Molicel cells so ideal? I read from different sources that they (P45B) seem to be one of the best and also the SP-140 is using Molicel cells.
On the other hand I can purchase packs with seemingly higher energy density like this one (not sure what cells they use):
Am I missing something?
It would theoretically be possible, but not optimal for a few reasons. Those are, compared to what we use, fairly high energy and low power cells, so you would probably need 6x of them (2s3p) to power an sp140 like its current battery.
1st point is cost. With those batteries, you will be around $4300 for the six batteries. For the sp140 battery pack, manufacting cost is around $1500.
2nd, they don’t have a battery management system. This adds significantly to both safety and convenience as it completely and actively manages multiple parameters on the battery cells. This nullifies the need for balancing chargers, allows faster charging, and reduces fire risk significantly.
3rd, battery cycle life. The molicel batteries will typically last around 500 cycles or longer depending on discharge rates and how deep of cycles they run. I cant find a lot of info on the linked batteries, but this prismatic style of lithium battery tends to have about half the cycle life.
You would have a flight time advantage as this battery would hold about 40% more energy at the same weight as the current molicel p42a pack.