Hi, Tomás and Joe. On 26/03/17 07:49, Joe wrote: >>>> [snip] >>>> >>>> Checking the purchase invoices, I bought the notebook on September >>>> 19, 2013, and then changed the battery on November 2, 2015. So >>>> less than two years ago I have this battery. >>>> >>>> The notebook I use it practically every day and I leave it >>>> sleeping from one day to the next so I do not have to open every >>>> application every time. I'm not sure if that impacts so much on >>>> the battery life. >>> If it was a long term degradation, possibly. With some battery >>> technology/technologies(?) there is a "memory" effect. If there is a >>> repeated "shallow discharge"/recharge cycle ( sleep overnight >>> followed by running during day with charger plugged in) the >>> effective battery capacity will decrease. IIRC that applies to only >>> one technology but can't remember which. >> That would be the nickel family (NiMH and its predecessors). Laptops >> changed long ago (I'd venture somewhere in the 90-ies) to Li-whatever. > Lithium isn't particularly sensitive to state and depth of charge, > apparently the optimal long-term storage state is about half-charge. >> Those have other weak spots: overcharging shortens their lives, >> especially being overcharged *and* higher temps. More overcharging >> leads to fireworks. They *need* some electronics to take care of >> that. Deep discharge is also fatal to their lifetimes. > Complete discharge is instantly fatal, they can never wake up again. > All lithium cells have rudimentary electronics to cut off discharge > earlier than this, typically 2.8-3.0V per cell. Charging is relatively > complex, constant current of about half capacity to around 4.1V, then > constant voltage to fairly precise 4.2V, then when the current drops > below a certain level, cutoff. > > It should be possible to leave a lithium battery permanently connected > to the charger. No 'trickle charge' will occur, no additional current > will flow until the cell voltage drops by a certain amount. But full > charge is not recommended for long-term storage. > > Yes, I had to build a lithium battery into something a few years ago, > I had to learn how to charge it. Thank you for sharing these interesting comments. I think some time I've inadvertently consumed the entire battery charge (although this was something that happened a long time ago, I think). Perhaps the recommendation to avoid this is to check the "Enable Power Management" option in KDE. Do you think that of the information I showed in /sys/class/power_supply/BAT0/uevent or /org/freedesktop/UPower/devices/battery_BAT0 can be detected any electrical problem with the battery? Kind regards, Daniel
Attachment:
signature.asc
Description: OpenPGP digital signature