For those wanting 26650s, check this out.

[Dr_Evil]

I was in my local Batteries + and noticed these. The price was somewhere around $12.

The package says 4600mAh. I figured it wouldn't hurt to buy one since I needed another one. The updated packaging says 13 amp max draw. I tested the capacity using a .5 amp draw. The capacity came out to 4343 and 4338 the 2 times I tested it. The remaining 26650 I bought from Light Hound a few years ago only came out around 3500.

 

[RedCowboy]

More important for our larger diodes is how much voltage drops under load, a NUBM44 with a SXD driver takes 3 amps from 2 x 26650's in series.

The purple Efest rated 4200mAh and 40 amps continuous and 60 amps surge hold at 4.0 volts from a full charge floating at 4.17 volts when loaded with a big 1 ohm resistor, but the IMREN 5200mAh drop to 3.5 volts into the same 1 ohm load.

This matters as the SXD drops out at 6.7 volts.

Typically higher mAh has higher internal resistance as well, the IMR/INR formulations are better for high drain, but if you have plenty of room and can series parallel several pairs than the higher mAh may be better for say, a portable self contained laser show.

 

[Benm]

It's not really a 'typical' relationship, as batteries get better you can get both an increase in capacity and decrease in internal resistance for a give form factor.

Most lithium cells are designed for relative low loads (under 1C) for use in laptops and similar applications. There are specialty cells designed to have a low internal resistance at the cost of capacity though. A typical application for those would be cordless power tools, but also applications like drones and other things that are required to work at high powre but only a short duration of time.

If you want to build a laser pointer or flashlight with a runtime of well under an hour you could consider these high peak power cells, although your heatsinking will also have to cope.

 

[icecruncher]

On a similar note - Has anyone tried this place?

Liion Wholesale Batteries | Li-ion battery distributor

Great price on Efest quality batteries and others (when available)

 

[Sta]

On a similar note - Has anyone tried this place?

Liion Wholesale Batteries | Li-ion battery distributor

Great price on Efest quality batteries and others (when available)

Yep, I bought seven NCR18650GA batteries from there. Great website. :beer:

 

[Pman]

Did you ever test the king Kong cells Red?