Battery test, what to include?

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HKJ
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2100 wrote:

Thanks for the good and hard work!  One thing to note is that in flashlights, unless you are in sub-zero conditions and at least a 5kph breeze, is that the cells would be somewhat warm.  ie from both the discharge as well as heat generated by the light being switched on continuously.    It is winter now, and if your house is at 10 deg C, it might not be a good indicator.   Lots of people live near the equator too.

But i don't think Denmark is that cold, so if the house is heated i guess it's ok.   Maybe place the cell on the charger (warm), probe it with a IR thermometer first?

 

It's 28.9 deg C in my house right now, and that is considered quite cooling.  I switch on the air-conditioning usually after i bathe....and keep it at 26 deg C (24 deg C at first to cool my body). At nearly 30 cents per kWh it is not cheap!

The test will be at 25 to 28 deg. C, that is my usual indoor temperature.

Outdoor we are just about down to freezing temperatures during the night, later in the winter it might go down to -10 deg. C or lower, but probably only for a short time.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Hikelite
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The Li-ions cells will no perform that good at 0 Celsius or 10 Celsius. They will improve in capacity if they are discharged at 40 Celsius or even higher. That is all manufactures say in their official graphs.

HKJ, have you though of test at -10C, 0C, 25C and 40-50C ambient temperature to see how the official ratings do ?

HKJ
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Hikelite wrote:

The Li-ions cells will no perform that good at 0 Celsius or 10 Celsius. They will improve in capacity if they are discharged at 40 Celsius or even higher. That is all manufactures say in their official graphs.

HKJ, have you though of test at -10C, 0C, 25C and 40-50C ambient temperature to see how the official ratings do ?

 

Not really, I do not have any equipment to easy do that. I could probably do a test in the fridge and the freezer or even the oven at low setting. This could be fun trying on a single cell, but it is not something I will be doing on all cells!

Anyway, I do not have time for it just now, most of my good equipment will be tied up on this big LiIon test for some time, but remind my again when the LiIon test is about finished.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

2100
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You guys have all the fun with all that cold weather.

One guy from Finland said he wants to relocated to Singapore though....he loves warm weather.  I told him it's fxxxing humid here, but he said that beats below -10 deg for a good part of the year.

My wife loves snow.  Think we'll be visiting Seoul sometimes in Feb (only time when we'll be free). Second time we'll be there.  Japan is quite "discounted" now in addition to Thailand, but general spending is still expensive in Japan, no make that !@#$!%$ expensive.

Hikelite
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HKJ wrote:

Hikelite wrote:

The Li-ions cells will no perform that good at 0 Celsius or 10 Celsius. They will improve in capacity if they are discharged at 40 Celsius or even higher. That is all manufactures say in their official graphs.

HKJ, have you though of test at -10C, 0C, 25C and 40-50C ambient temperature to see how the official ratings do ?

 

Not really, I do not have any equipment to easy do that. I could probably do a test in the fridge and the freezer or even the oven at low setting. This could be fun trying on a single cell, but it is not something I will be doing on all cells!

Anyway, I do not have time for it just now, most of my good equipment will be tied up on this big LiIon test for some time, but remind my again when the LiIon test is about finished.

OK, I understand.

Well you never know you might end up find the best performer in -10 ambient. Maybe we'll have cold best performer and a hot best performer. Quite unlikely, however it would be something very interesting. 

Hikelite
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2100 wrote:

You guys have all the fun with all that cold weather.

......

I actually wonder if we really have the fun, since li-ion perform very bad on low temperatures. But then again the low temperatures are good for the LED.

HKJ
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Playing around with the data from a few tests I tried doing these bar graphs, that shows the capacity down to a higher voltage than I tested to (2.8 volt).

I could be useful sometimes, but what voltages are most interesting?

 

 

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Olli1783
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wow Thanks HKJ

Noctigon Meteor M43 

ri chevy
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Wow.  That is a very interesting comparison.  Thank you. 

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