In article ,
Eric Greenwell wrote:

* the cell phone, laptop, power tool batteries are high volume
production products. My guess is they are likely more consistent
in quality than buying hand assembled, small batch (or only
one-at-a-time) units.
* they all have dedicated, proprietary chargers that plug in to only
their intended battery

Are you referring to internal charging circuitry with this last item?
Because many (most?) cell phones will charge off any standard USB port,
as long as you have the appropriate cable (and many can use a standard
USB cable for it). I believe the batteries themselves have enough
circuitry that the external charger doesn't need to be all that good to
keep things safe.

I agree with your point overall. While I carry my cell phone with me in
flight without a second thought, I'd be hesitant to have an order of
magnitude more battery capacity on board in Li-ion form.

--
Mike Ash
Radio Free Earth
Broadcasting from our climate-controlled studios deep inside the Moon