[chbot] 18650 Lithium ion re-chargable

[Helmut Walle]

"Legit" is quite a vague term if the real question is about quality... a 
range of manufacturers are making this format of Li-Ion battery, and 
they are not all born equal. Criteria to look at:

- Capacity: they all have nominally the same dimensions but not the same 
capacity
- ESR, i.e., how much current do they deliver under which load
- Capacity under different load conditions
- Size differences (as in diameter and length)
- Cycle life, and this is a real quality point where batteries from 
different manufacturers may perform very very differently
- Saftey, i.e., do they have protection electronics built-in, and also 
have their been incidents with the specific make & model you are looking 
at (think Galaxy S7...)
- anything else that matters to you?

Here is an older comparison with measurements of 18650, but it gives you 
an idea of the spread of some of the above parameters that may matter to 
you.

http://www.candlepowerforums.com/vb/showthread.php?257543-LiIon-18650-battery-comparison

Kind regards,

Helmut.


On 08/03/17 16:47, St George wrote:
> Looks like the price for these batteries sourced in NZ is around $20 each.
> Aliexpress has prices around $4. Any chance these batteries are legit?
>
>