Peter Rapisarda wrote: > cat /proc/acpi/battery/BAT0/info > present: yes
This information is in conflict with the previous information that you posted saying that you didn't have any battery directories but just AC directories. Perhaps between then and now your battery became connected? Because at boot time if the battery is detected then it should provide this directory of information. If it isn't then it doesn't. It is fully dynamic with every boot. The /proc isn't really a filesystem but an interface to the kernel. It is a memory only filesystem presenting an interface of information and controls. > design capacity: 4400 mAh The battery says it has a vendor new rating of 4.4 amp-hours. (It can supply one amp of current for 4.4 hours. Or two amps of current for 2.2 hours. A typical machine pulls between 1-2 amps during running and that would normally provide between 2-4 hours of runtime.) > last full capacity: 3334 mAh The battery says that when last charged it was able to hold 3.3 amp hours of charge. That is a degradation of 75% from new. That isn't terribly terrible. My own main battery is sitting at around 90% at the moment. (I have a big extended capacity 9 cell 7.7 AH battery. The standard 6-cell for my machine has around 4.6 AH standard capacity.) Batteries age over time as they are used. If it were really very bad then I would expect it to say something down in the one amp-hour range. The rest of the information is vaguely interesting data about the battery and was pretty much as expected. But there was something that seemed a little odd to me. > battery technology: rechargeable > design voltage: 14800 mV > design capacity warning: 440 mAh > design capacity low: 133 mAh > capacity granularity 1: 44 mAh > capacity granularity 2: 44 mAh > model number: DELL53LSN > serial number: 678 > battery type: LION > OEM info: Sanyo > > cat /proc/acpi/battery/BAT0/state > present: yes > capacity state: ok > charging state: charged > present rate: 1 mA > remaining capacity: 4400 mAh > present voltage: 16748 mV Here it is showing that while the battery is charged that it is still charging the battery at a rate of 1 milli-amp. If it is charged then I would expect the rate to be zero. Otherwise it will continue to charge (although at a very slow rate) which will eventually "cook" the battery. Excess charge can't be stored after the battery is fully chemically converted and the excess energy will be converted to heat energy. This is a topic that everyone has an opinion upon and my opinion is that this often results in out-gassing of battery chemicals resulting in reduced battery capacity. > Does this mean anything to you? And just to be clear this is the old, > presumably non-functioning, battery. That data doesn't look like a non-functioning battery. It looks like it has 3.3 AH of capacity. If you removed the AC power it should provide power to your laptop for at least some while. If you could see the rate that it was discharging at that time then you would be able to calculate an approximate runtime for that battery. However I have found that in practice the firmware calculating these values may be wildly optimistic and the values may change wildly during operation. In other words... You have to try it and see how well it actually performs and even though it says 3.3 AH it may result in something much different after a few battery cycles. But if you remove AC power and the machine drops out immediately without any sign of battery being used then something bad is happening. Perhaps the firmware is lying to you. It wouldn't be the first time. Or something else must be wrong. At that point I don't know. Bob
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