Nick Odell wrote:
On Sat, 17 Apr 2021 15:25:52 +0100, The Natural Philosopher
wrote:

On 17/04/2021 15:01, Theo wrote:
Nick Odell wrote:
I was just wondering how the performance of these LiPos compare with a
more conventional rechargeable lithium 123 cell. The 123 only weighs
4g more than the LiPo yet seem to have many times the storage capacity
so presumably there must be some reason why they aren't used in this
application. Any thoughts?
I don't know what you mean by '123 cell' (as mentioned a CR123 is
non-rechargeable. The company A123 Systems made lithium iron phosphate for
EVs etc, probably a bit large for you!), but possibly the amount of current
that can be drawn. A drone is going to take much more continuously than a
camera.

Theo

model planes will fly on 123s. They are better than Nixx. But LIPO is
simply better than either.

In what respect better? Are the LiPos better able to sustain a high
current drain? It was my suspicion that they might not be equal to
several minutes sustained flight that made me ask the question rather
than lash one up in the helicopter body.


Nick

I saw an article about RC cars, showing the "best" batteries
available. You get effects like this:

Storage Max-Current
1500mA 20000 ma
3000mA 10000 ma

The reason a low capacity battery was fitted to the helicopter,
could be to enhance available peak current flow. Making short
trips work better.

The peak current is not stamped on the battery. They
only stamp the capacity on them (3500maH for Panasonic,
compared to "10000maH" for a chinese one :-) ). You need
the datasheet or website, to get the max-current value.

You need to find vendors with complete tables of batteries
for sale ("capacity" batteries versus "current" batteries),
to discover how the specs and size, influence results. One
site I checked, one of the results was entirely unintuitive.
(One of their "current" batteries was just horrible max-current.)
Then you need accurate weight values, to decide whether
they're good for the job.

Paul