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#1
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netbook doesn't finish charging
I have an Acer netbook, and the battery loses a lot of juice when it's
off. I turned it on last night and it was down to 25%, after sitting for 2 months or more. I plug in the charger and the Power Meter window says its charging, and it slowly climbs to 90%. About that time, I noticed that it doesn't say "charging" anymore, even though it says "AC power". Until today, I thought it always said "charging" when it said AC power. Unless maybe it was up to 100%. Does this mean the battery can only charge to 92**%? I would have thought the computer would think that was 100% if that was as high as it would go, or if the current in had reached zero**. Does this mean the current is still going in, but somehow that doesn't make the percentage go up? Why not? ***Last night the current into the camera reached zero. But that was USB and my USB meter worked. I don't have one for this barrel plug. **It finally made it to 92. |
#2
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netbook doesn't finish charging
Micky wrote:
I have an Acer netbook, and the battery loses a lot of juice when it's off. I turned it on last night and it was down to 25%, after sitting for 2 months or more. I plug in the charger and the Power Meter window says its charging, and it slowly climbs to 90%. About that time, I noticed that it doesn't say "charging" anymore, even though it says "AC power". Until today, I thought it always said "charging" when it said AC power. Unless maybe it was up to 100%. Does this mean the battery can only charge to 92**%? I would have thought the computer would think that was 100% if that was as high as it would go, or if the current in had reached zero**. Does this mean the current is still going in, but somehow that doesn't make the percentage go up? Why not? ***Last night the current into the camera reached zero. But that was USB and my USB meter worked. I don't have one for this barrel plug. **It finally made it to 92. Charge rate slows considerably at 90% to protect the lithium battery from overheating and igniting (should the internal protection circuitry inside the battery pack fail). If you go online and look at charging rates for lithium battery (and how chargers should operate with their own protections), the charging rate slows at 90%. http://batteryuniversity.com/learn/a..._ion_batteries Table 3 shows the charge capacity (dotted black line) tapers off at around 90%. The chart also shows that getting to 90% takes a lot less time than getting the rest of the 10% top charge. Sorry but I don't have your unidentified Acer netbook to know why their meter software decides to stop saying "charging" at 90%. Maybe it only detects charging when the amperage to the battery exceeds some amount. Charging is based on sensing the amperage rate (how resistance increases) along with voltage and some precepts on the rate curves for effective charging of lithium chemistries. What the netbooks says is 92% may be 100% for an old battery (see next). Has the netbook always been that way or you just noticed the artifact? Batteries are chemical and they lose capacity (storage), load handling, and efficiency with age. Capacity drops 80% per 2 years but this varies with heavy load (lots of charging cycles), environment (temperatures), and quality of construction. After 2 years: 80% capacity. After 4 years: 80% x 80% = 64% capacity. After 6 years: 80% x 80% x 80% = 51%. Many drop capacity much faster. As the chemical composition degrades, charge time increases but won't reach full charge anymore. With the safety in charging for lithium, the charger will slow down the charge rate so you won't get a full charge any more. http://www.ebay.com/gds/What-is-the-...7629697/g.html You did not mention how old is the battery pack. If over 3-4 years old, might be time to start hunting for a replacement. They don't last that long. They have a limited number of charging cycles, the chemicals deplete, and they lose capacity so runtime wanes along with capacity retention during storage. How long before you replace the battery in your car despite you drive it every day to keep it charged via alternator? http://batteryuniversity.com/learn/a...ased_batteries |
#3
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netbook doesn't finish charging
[Default] On Tue, 12 Jul 2016 11:25:35 -0500, in
microsoft.public.windowsxp.general VanguardLH wrote: Micky wrote: I have an Acer netbook, and the battery loses a lot of juice when it's off. I turned it on last night and it was down to 25%, after sitting for 2 months or more. I plug in the charger and the Power Meter window says its charging, and it slowly climbs to 90%. About that time, I noticed that it doesn't say "charging" anymore, even though it says "AC power". Until today, I thought it always said "charging" when it said AC power. Unless maybe it was up to 100%. Does this mean the battery can only charge to 92**%? I would have thought the computer would think that was 100% if that was as high as it would go, or if the current in had reached zero**. Does this mean the current is still going in, but somehow that doesn't make the percentage go up? Why not? ***Last night the current into the camera reached zero. But that was USB and my USB meter worked. I don't have one for this barrel plug. **It finally made it to 92. Charge rate slows considerably at 90% to protect the lithium battery from overheating and igniting (should the internal protection circuitry inside the battery pack fail). If you go online and look at charging rates for lithium battery (and how chargers should operate with their own protections), the charging rate slows at 90%. http://batteryuniversity.com/learn/a..._ion_batteries Table 3 shows the charge capacity (dotted black line) tapers off at around 90%. The chart also shows that getting to 90% takes a lot less time than getting the rest of the 10% top charge. Sorry but I don't have your unidentified Acer netbook to know why their meter software decides to stop saying "charging" at 90%. Maybe it only detects charging when the amperage to the battery exceeds some amount. This sounds reasonsable and your explanation below does also. At any rate it stayed firmly fixed at 90% for maybe 8 hours over several days of use, but one day I left it on or needed it on for 6 or 8 hours in a row and I wasn't watching but i noticed at the end it was finally at 100% I'm going to buy another battery! Thanks. Charging is based on sensing the amperage rate (how resistance increases) along with voltage and some precepts on the rate curves for effective charging of lithium chemistries. What the netbooks says is 92% may be 100% for an old battery (see next). Has the netbook always been that way or you just noticed the artifact? Batteries are chemical and they lose capacity (storage), load handling, and efficiency with age. Capacity drops 80% per 2 years but this varies with heavy load (lots of charging cycles), environment (temperatures), and quality of construction. After 2 years: 80% capacity. After 4 years: 80% x 80% = 64% capacity. After 6 years: 80% x 80% x 80% = 51%. Many drop capacity much faster. As the chemical composition degrades, charge time increases but won't reach full charge anymore. With the safety in charging for lithium, the charger will slow down the charge rate so you won't get a full charge any more. http://www.ebay.com/gds/What-is-the-...7629697/g.html You did not mention how old is the battery pack. If over 3-4 years old, might be time to start hunting for a replacement. They don't last that long. They have a limited number of charging cycles, the chemicals deplete, and they lose capacity so runtime wanes along with capacity retention during storage. How long before you replace the battery in your car despite you drive it every day to keep it charged via alternator? http://batteryuniversity.com/learn/a...ased_batteries |
#4
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netbook doesn't finish charging
[Default] On Tue, 19 Jul 2016 02:34:04 -0400, in
microsoft.public.windowsxp.general Micky wrote: [Default] On Tue, 12 Jul 2016 11:25:35 -0500, in microsoft.public.windowsxp.general VanguardLH wrote: Micky wrote: I have an Acer netbook, and the battery loses a lot of juice when it's off. I turned it on last night and it was down to 25%, after sitting for 2 months or more. I plug in the charger and the Power Meter window says its charging, and it slowly climbs to 90%. About that time, I noticed that it doesn't say "charging" anymore, even though it says "AC power". Until today, I thought it always said "charging" when it said AC power. Unless maybe it was up to 100%. Does this mean the battery can only charge to 92**%? I would have thought the computer would think that was 100% if that was as high as it would go, or if the current in had reached zero**. Does this mean the current is still going in, but somehow that doesn't make the percentage go up? Why not? ***Last night the current into the camera reached zero. But that was USB and my USB meter worked. I don't have one for this barrel plug. **It finally made it to 92. Charge rate slows considerably at 90% to protect the lithium battery from overheating and igniting (should the internal protection circuitry inside the battery pack fail). If you go online and look at charging rates for lithium battery (and how chargers should operate with their own protections), the charging rate slows at 90%. http://batteryuniversity.com/learn/a..._ion_batteries Table 3 shows the charge capacity (dotted black line) tapers off at around 90%. The chart also shows that getting to 90% takes a lot less time than getting the rest of the 10% top charge. Sorry but I don't have your unidentified Acer netbook to know why their meter software decides to stop saying "charging" at 90%. Maybe it only detects charging when the amperage to the battery exceeds some amount. This sounds reasonsable and your explanation below does also. At any rate it stayed firmly fixed at 90% for maybe 8 hours over several days of use, but one day I left it on or needed it on for 6 or 8 hours in a row and I wasn't watching but i noticed at the end it was finally at 100% I'm going to buy another battery! Thanks. I said this somewhere else, but since I came across the original thread, I'll repeat, that I left it charging for a very long time and it made it up to 100%. I've been using it frequently and with the charger so it's still 100%. But I'm still going to buy another battery. Charging is based on sensing the amperage rate (how resistance increases) along with voltage and some precepts on the rate curves for effective charging of lithium chemistries. What the netbooks says is 92% may be 100% for an old battery (see next). Has the netbook always been that way or you just noticed the artifact? Batteries are chemical and they lose capacity (storage), load handling, and efficiency with age. Capacity drops 80% per 2 years but this varies with heavy load (lots of charging cycles), environment (temperatures), and quality of construction. After 2 years: 80% capacity. After 4 years: 80% x 80% = 64% capacity. After 6 years: 80% x 80% x 80% = 51%. Many drop capacity much faster. As the chemical composition degrades, charge time increases but won't reach full charge anymore. With the safety in charging for lithium, the charger will slow down the charge rate so you won't get a full charge any more. http://www.ebay.com/gds/What-is-the-...7629697/g.html You did not mention how old is the battery pack. If over 3-4 years old, might be time to start hunting for a replacement. They don't last that long. They have a limited number of charging cycles, the chemicals deplete, and they lose capacity so runtime wanes along with capacity retention during storage. How long before you replace the battery in your car despite you drive it every day to keep it charged via alternator? http://batteryuniversity.com/learn/a...ased_batteries |
#5
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netbook doesn't finish charging
On 7/25/2016 2:48 AM, Micky wrote:
You did not mention how old is the battery pack. If over 3-4 years old, might be time to start hunting for a replacement. They don't last that long. They have a limited number of charging cycles, the chemicals deplete, and they lose capacity so runtime wanes along with capacity retention during storage. How long before you replace the battery in your car despite you drive it every day to keep it charged via alternator? http://batteryuniversity.com/learn/a...ased_batteries Where do you get a replacement battery? Unless the device was extremely popular and long lived, they probably quit making batteries for it before they quit selling it. Any battery you do find may have been sitting in a container in Arizona for 5 years. And the aftermarket batteries in the container in China may have been built with crap cells in the first place. |
#6
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netbook doesn't finish charging
mike wrote:
Where do you get a replacement battery? Micky, not me, probably needs a new battery. Micky never mentioned his model, just "Acer netbook" which gives no details on WHICH one he has to then lookup who might have a newly manufactured battery for it. To save on tooling or parts costs, manufacturers continue using the same parts for awhile even into newer models. Micky never mentioned the model of his Acer netbook or how old it is. So far, only *MICKY* knows the model and age of his netbook. (Note: I am not bothering to hunt through his past posts in other discussions to find that info, if present.) |
#7
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netbook doesn't finish charging
On 7/25/2016 10:04 PM, VanguardLH wrote:
mike wrote: Where do you get a replacement battery? Micky, not me, probably needs a new battery. Micky never mentioned his model, just "Acer netbook" which gives no details on WHICH one he has to then lookup who might have a newly manufactured battery for it. To save on tooling or parts costs, manufacturers continue using the same parts for awhile even into newer models. OK, but that still doesn't address the issue. Some batteries have human readable date codes, some don't. And getting a random online vendor to go look up the date code isn't likely to happen. Just because the manufacturer uses the same plastic doesn't guarantee that the battery you get from a random recycler is anywhere near new. Storage history matters a lot. Anecdotes abound about people getting new, but non-working batteries off EBAY. Micky never mentioned the model of his Acer netbook or how old it is. So far, only *MICKY* knows the model and age of his netbook. (Note: I am not bothering to hunt through his past posts in other discussions to find that info, if present.) |
#8
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netbook doesn't finish charging
Once upon a time on usenet mike wrote:
On 7/25/2016 10:04 PM, VanguardLH wrote: mike wrote: Where do you get a replacement battery? Micky, not me, probably needs a new battery. Micky never mentioned his model, just "Acer netbook" which gives no details on WHICH one he has to then lookup who might have a newly manufactured battery for it. To save on tooling or parts costs, manufacturers continue using the same parts for awhile even into newer models. OK, but that still doesn't address the issue. Some batteries have human readable date codes, some don't. And getting a random online vendor to go look up the date code isn't likely to happen. Just because the manufacturer uses the same plastic doesn't guarantee that the battery you get from a random recycler is anywhere near new. Storage history matters a lot. Anecdotes abound about people getting new, but non-working batteries off EBAY. Micky never mentioned the model of his Acer netbook or how old it is. So far, only *MICKY* knows the model and age of his netbook. (Note: I am not bothering to hunt through his past posts in other discussions to find that info, if present.) Logically this level of concern dictates that you rebuild your own batteries using newly-manufactured A grade cells. Otherwise you'll always be wondering .... -- Shaun. "Humans will have advanced a long, long way when religious belief has a cozy little classification in the DSM*." David Melville (in r.a.s.f1) (*Diagnostic and Statistical Manual of Mental Disorders) |
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