New here with a latitude d820 issue

Hello everyone,i recently purchased a d820 and when i got it home i noticed it had the battery not detected light on.i bought an aftermarket battery(ebay).now the light is off but....when i unplug the charger and leave the computer on.after 15 minutes or so,the computer goes dark and will not reboot without the charger plugged in.any ideas???please help.thanks

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Very low capacity battery?

 

The battery is labeled as a 11.1 volt 7800mah/87wh.assuming this is correct,anything else i can look at.one more thing,when i got the batt i did not read the installation instructions which said to install the batt and run it down to 2% capacity before charging.all i can get it to do is charge to about 86% full.any correlation with my issue perhaps?thanks

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Labels don't necessarily mean anything, especially on aftermarket batteries. Well, not without a teardown and inspection of the 18650 cells used, and/or individual testing of them.

By "very low capacity" i meant the actual capacity, not necessarily "what it says on the label". If it won't even charge up to 100%, that should be a dead giveaway that something ain't quite 100% right in there...

 

I agree,im wondering being that i didnt let it discharge via the instructions if i hurt the battery.your thoughts on that.thanks

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Highly doubtful. I'd rather suspect crappy / ancient (re-used) cells.

 

Thanks,ill attempt to return it for another one.thanks for your help.ill update this when i get another battery.

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Run BatteryInfoView which provides useful status on the battery. How do the Current capacity and Full charged capacity compare with the Design capacity (which should correspond with the label)?

John

 

Partially "inspired" by this, after coming across the battery from my first laptop (from 10 years ago; passed on to dad when i got a new one), i noticed it was an aftermarket one. Since that laptop was long dead and out of use, i decided to pop open the casing, check the cells and set them aside for later re-use in (other) projects.

Good news - cells were Samsung ICR18650-22E.
Bad news - they were re-used, and had been partially mutilated during the recover from their previous home / application (insulation sleeve sliced off top to bottom on a few, mangled in a few places on others). They did bother slapping on some Kapton tape here and there, but kinda sketchy overall.

One parallel pair (out of three series'd up parallel pairs) was down to a not-good 1.4V, the other two at 3.7V. One cell from that pair seems to have recovered nicely voltage-wise; capacity-wise (mAh / Wh) remains to be tested. Second one is "in progress".

Buying aftermarket batteries "is like a box o' chocolates - ya never know what you're gonna get"... (assuming you've seen Forrest Gump)

And 5200mAh? Suuuure, but not on this planet. 2 * 2200mAh (two strings of 2200mAh cells in parallel), and that's with a certain degree of optimism (given these weren't new cells when they were put into this), falls a teensy bit short of that, in my book...