Laptop 18650s

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Rees

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I have had a laptop hanging around for awhile and didnt know if the cells would be worth taking out or not.
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Well there clearly panasonic cells, but i didnt see a mah rating, but the casing said the battery pack was 14.4v and 4400mah. the laptop hasnt been used for around 2 years.
 
just didnt know if they may even have a chance of being good still. the laptop charger is integrated into the mother board and burnt out. so the laptop shutdown from batteries dieing about 2 years ago and didnt know if they would be worth taking out?
 
Should be a 2200mah battery. Panasonic now has 3100mah batteries that are sold from various venders with a pcb added. I prefer the protected batteries over the raw cells. Run in single cell lights they should be fine. Charge them up and check the resting voltage over a day or so. If the cell voltage keeps declining the cell probably is bad. If it will hold a voltage at some where around 4.1v then they are probably good. A discharge test for capacity will also help. Some good reading here.
 
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Rees said:
just didnt know if they may even have a chance of being good still.
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I scavenged old Sony S18650GR 2200 mah cells from an old laptop that were well over 5 years old (I would guess 8 years). I measured two of them on my hobby charger and they went 1980 and 1973 mah. Panasonics should be just as good as Sonys. The next day they both measured 4.19V.
 
I honestly doubt those cells have more than 1500mAh remaining capacity. They are a really old model probably 7-8 years old. Probably best to recycle them.
 
Rees said:
i didnt see a mah rating, but the casing said the battery pack was 14.4v and 4400mah. the laptop hasnt been used for around 2 years.
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This looks to be 4s2p setup. Where there are 4 batteries connected in series and 2 in parallel.

Nominal voltage is 3.6V and nominal charge is 2200 mAh, so you get the battery pack figure of: 14.4V & 4400 mAh. Because 3.6 x 4 = 14.4 and 2200 x 2 = 4400
 
charge them and rest 1 day and check for cell voltage. cells usable if voltage reading above 4V

also check capacity. you may not be get 2200mAh.. at least 1600mAh..
 
I would avoid using those particular cells because of the style of insulator used. It does not wrap around the bottom of the can completely, and thus presents a possible shorting hazard for positive hosts, and possible switching problems with negative hosts.
 
bshanahan14rulz said:
I would avoid using those particular cells because of the style of insulator used. It does not wrap around the bottom of the can completely, and thus presents a possible shorting hazard for positive hosts, and possible switching problems with negative hosts.
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you can insulate those cells with shrink wrap tubings :D
 
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