LR1865SI replacement for laptop battery pack

tesla777

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Jan 7, 2021
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Hello folks,

I have a battery pack of six "LS LR1865SI DP1488 00008811" and I want to know what are the recommended replacements.

I gather that I need cells of a similar charging/discharging current and similar capacity.

Would the LGDAS31865 be an ok replacement? They are readily available in my area, but I see the discharging current is less than half.

Any help or suggestion would be greatly appreciated.
 

OffGridInTheCity

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The main difference between the cell you have and the new/suggested cell - according to the specs - is the standard discharge number. The original one shows "1075mA Standard" and the new one shows 1/2 that at "430mA Standard". The original one may have been over-qualified for the application.

So I would ask - what is the application / load requirement?
 

tesla777

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So I would ask - what is the application / load requirement?
Yes, sure. It's for a laptop battery pack. I couldn't measure the load. I will lock the CPU clock at its lowest when using only the battery. CPU is i5-4200M.

The main difference between the cell you have and the new/suggested cell - according to the specs - is the standard discharge number. The original one shows "1075mA Standard" and the new one shows 1/2 that at "430mA Standard". The original one may have been over-qualified for the application.
Probably you are right about the over-qualification of the original one. It seems to be a cheap cell.

I'd like to know what are the most common (readily available) replacements for a cell with the same discharge rate or maybe slightly below.
 

tesla777

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I just found this cell B18650CA which fits the specs and I can buy it locally.
Is it an issue that the nominal voltage is 3.6v instead of 3.7v? I'd guess that .3v wouldn't make a difference, but I'm not sure.
The cutoff voltage is also 2.7v vs. 3v of the original one.
 
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OffGridInTheCity

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I just found this cell B18650CA which fits the specs and I can buy it locally.
Is it an issue that the nominal voltage is 3.6v instead of 3.7v? I'd guess that .3v wouldn't make a difference, but I'm not sure.
The cutoff voltage is also 2.7v vs. 3v of the original one.
No - the 'nominal voltage' is not important. 18650(s) share compatible min/max voltage ranges - e.g. 4.2v max. I've heard a few cases where they say 4.35v but higher is perfectly safe. The min (2.7v vs 3.0v) will not make any difference as there is literally no power left below 3.4v-3.3v.

Laptop application - the original ones you picked would probably be fine as that's a pretty gentle load (as compared to an ebike or skateboard). Its not wrong/risky to use 470mah standard discharge for a laptop but you might find the cells don't last as long under heavy CPU use depending on your laptop specs.

Since you found cells with exact specs and if price is reasonable - I would go for it :)
 
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tesla777

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That sounds fine then! I'll probably go ahead and buy the B18650CA cells at a good price.
I'll keep looking around for a few more days and if I find cheaper/better cells I'll post back.
Thank you for your help and guidance OffGridInTheCity
 
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