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Discharge to Storage Percentage After Autocycle / Calibrate

comprensoldotna
(@comprensoldotna)
Active Member Customer

I do have one suggestion for a software addition.  It is bad for lithium ions to store them at 100% charge, 60-80% is supposed to be your butter zone for storage.  It would be nice if in your AutoCycle / Calibrate tab there was an option to drain to X% after autocycle count.  There's even an empty box in the middle center under Autocycle count that would be perfect for it.

We will be using your product exclusively for testing, marking health, and then storing the hundreds of laptop batteries we have amassed over the years as a computer sales & repair shop.  For ease of work flow this option would be nice as a one click and done solution before putting the batteries in storage.

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Topic starter Posted : 08/09/2021 8:43 pm
Nicusor
(@azzido)
Member Admin

Note that you have to calibrate again the batteries if you store them for a long period like more than 1-2 months. In such cases, it is faster to only charge the batteries to a specific level.If you store the batteries only after you see the calibration results then yes.

NLBA Laptop Battery Analyzer with Chip Reset & Repair Option

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Posted : 09/09/2021 2:42 pm
comprensoldotna
(@comprensoldotna)
Active Member Customer

@azzido For our purposes with used batteries we will be selling for @ $20 each it is simply not worth the man hours to pull the batteries frequently and re-calibrate them.  Our goal with the battery analyzer was simply to see if the hundreds of batteries we already have in storage are still viable, what is their current capacity compared to new, and raise their charge up so they can be stored for longer.  Charged lithium ion batteries can be stored for up to a decade and still remain viable, but if they sit at a 0% charge for to long it will kill them.  Even in the worst case scenario of 2% charge loss per month that means a battery stored at 80% will take just over 3 years to drain to zero, in the best case scenario at a 1% loss per month you are looking at just over 6 years storage time from 80%.  If you look around online you will find many sources that can confirm what I said in my first post that ideal storage charge level is 40-80% and that leaving lithium's at 100% degrades their health much quicker.

Quote From Linked Web Site: "The moment that batteries with lithium-ion chemistries are placed into storage, they will experience a discharge rate of 5 percent within the first 24 hours at normal room temperatures. Then it will go through a self-discharge rate of 1 to 2 percent every month."

Ref: https://blog.epectec.com/battery-storage-and-charge-management-best-practices

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Topic starter Posted : 09/09/2021 9:20 pm
Nicusor
(@azzido)
Member Admin

@comprensoldotna 

Did I say that storing a battery at SoC=100% is good ? I think you did not get my previous post.

I was giving you a recommendation since performing a calibration cycle takes time. If you plan to store batteries for many months or even years then you miss one important thing. Not only the charging level will drop but also the capacity, so the FCC will not reflect the real capacity and you have to calibrate them again.

If you have hundreds of batteries you can do quick tests like checking Internal Resistance, Checking Discharging Curves for the cells voltage which could take only few minutes then charge them to SoC=70% and that's it.

NLBA Laptop Battery Analyzer with Chip Reset & Repair Option

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Posted : 10/09/2021 3:27 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator
Posted by: @azzido

then charge them to SoC=70% and that's it

Could it be done automatically i.e. charge will stop at 70% itself or user should monitor the SoC level to press Stop button in time?

 

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Posted : 10/09/2021 5:39 pm
Nicusor
(@azzido)
Member Admin

Automatically in the Charge Tab under End Charging Conditions.

NLBA Laptop Battery Analyzer with Chip Reset & Repair Option

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Posted : 10/09/2021 5:50 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

At least it will require spending the time to change it from 100% to storage level and then back to 100% for next battery to autocycle it.

For several batteries it's not the issue but for business customers who deal with hundreds and thousands of batteries it will take their man-hours and become annoying.

Adding the DTS (Discharge To Storage) option would be great improvement to the software and will save the working time by running full Charge-Discharge-Storage cycle in one click.

 

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Posted : 10/09/2021 6:18 pm
comprensoldotna
(@comprensoldotna)
Active Member Customer
Posted by: @djibattworkshop

At least it will require spending the time to change it from 100% to storage level and then back to 100% for next battery to autocycle it.

For several batteries it's not the issue but for business customers who deal with hundreds and thousands of batteries it will take their man-hours and become annoying.

Adding the DTS (Discharge To Storage) option would be great improvement to the software and will save the working time by running full Charge-Discharge-Storage cycle in one click.

 

Yeah and this is exactly what I'm looking for.  I would like to do a full Autocycle/calibrate to get the battery health with current maximum capacity to note on the battery itself at the time of testing and then leave it in a healthier state than 0% or 100% for storage with a single click.  Minimal man hours involved, battery life extended, and ideal long term storage charge gained in one click.

Thanks @djibattworkshop

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Topic starter Posted : 11/09/2021 7:58 am
comprensoldotna
(@comprensoldotna)
Active Member Customer
Posted by: @djibattworkshop
Posted by: @azzido

then charge them to SoC=70% and that's it

Could it be done automatically i.e. charge will stop at 70% itself or user should monitor the SoC level to press Stop button in time?

 

Yes this might be in the charging tab, but this option does not exist in the "Autocycle / Calibrate" tab to get us an idea of current battery health and capacity compared to original.

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Topic starter Posted : 11/09/2021 8:00 am
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