On 30/05/17 12:57, Jeff Liebermann wrote:
On Mon, 29 May 2017 18:10:06 -0700, mike wrote:
I'd agree, but many of my devices won't run on that voltage.
Wireless power monitors and thermometers, for example.
Most everything that will run on alkaline cells will also run on LSD
NiMH cells.

However, you can't just plug in a LiIon cell into a device made for
alkaline cells, even if they fit. For example, if you try to replace
a common AA alkaline cell with a 14500 LiIon cell, you are replacing a
1.5V cell with a 3.6V cell, which will likely burn out the device.
However, you may be able to replace two AA alkaline cells with a
single LiIon cell if device will tolerate a 20% increase in battery
voltage.

They even sell blank AA cells (containing a wire from +ve to -ve)
for devices that can use one Li cell instead of two alkalines.
I use these in an Apple Bluetooth keyboard for example.

What's your experience with 14500 in single AA flashlights?
The Cree XP-E Q5 LED is designed to operate at about 350ma and will
generate about 120 lumens depending on type and bin selection:
http://www.cree.com/led-components/media/documents/XLampXPE-25A.pdf
That's about:
120 lm / (3.6v * 0.35A) = 95 lumens/watt
which is consistent with todays LEDs at room temp. There is no way
the XP-E Q5 LED will dissipate 7 watts or produce 600+ lumens.

Except in Chinese marketing materials

Lowes has a six-cell 18650 lithium tool battery for $10.
Only 1.5AH, but rated for 30 Amps max.
Was gonna replace NiCd in an old drill, but I'm procrastinating.

It depends on which tool and how the conversion is done.

I did this with my Ryobi, and use it every day:
http://polyplex.org/electronics/ryobi_lifepo4/index.html
It used to have 11 stubby NiCD cells, now four 26550 LiIons.
Recently reworked with a female balance connector, after it
short circuited in a toolbox and burnt one of the wires.

If you plan to do this, make sure
you use a LiIon/LiPo/whatever charger.

Hobbyking supplied a Turnigy Accucel-6 for $25, which runs nicely
off an old laptop power brick.

Clifford Heath.