A:“the li-ion battery depletes for various reasons but the one reason most people believe it depletes doesn’t happen
it does not deplete with discharge, it depletes with re-charge!
a deposit left by the charge cycle (not the discharge cycle) will increase resistance, obviously the more deposits the more the resistance, thus a charging depletion
in other words, it’s not a good idea to leave your laptop plugged in with the laptop battery in place if the battery already has a charge
if you need the greater performance mode while plugged in and also want best use out of your battery, remove the battery while on the grid!!!
now, the lower the voltage the less you notice charge depletion so it’s not an important consideration on small lower voltage devices
I will get in touch with my contacts at microsoft and see why they do not have a “no charging mode” designed into the operating system or hardware
that’s not the only thing but it’s most of it, I had read tech reports that informed me the laptop battery is time depleted and that’s true but not nearly as important as charge depletion
for time depletion the battery loses 20 percent of it’s capacity every year, but only if it’s at full charge!
it depletes less over time according to the level of charge!!!
in other words, the longer the dell laptop battery enjoys full charge the shorter the duty cycle!!!!! (counter intuitive and an oposite effect when compared to wet cells, I don’t know about nicads though)
my batteries seem to last about a year every time and I just found out, this is because they are ALWAYS charged or always being charged!!!
so my battery is always being time depleted to the fullest and charge depleted constantly”
B:“The li-ion battery depletes for various reasons but the one reason most people believe it depletes doesn’t happen it does not deplete with discharge, it depletes with re-charge!
Terminology is incorrect. All batteries deplete from discharge. Battery energy storage capacity degrades based on problems with non-reversible chemistry reactions during charge or discharge. Sufficient degradation results in the battery no longer being able to provide enough voltage for long enough to be useful. Degradation also occurs from increased resistance of the anode and cathode from depositing out of contaminats in the electrolytes and reduction in effective surface area.
a deposit left by the charge cycle (not the discharge cycle) will increase resistance, obviously the more deposits the more the resistance, thus a charging depletion
Deposits are left on both the battery anode and cathode during charge/discharge. Since you can not have discharge without charge assigning degradation to one instead of the other is misleading. The battery charges job is to prevent over charge which leads to catastrophic failure in any rechargeable battery. Battery resistance is increased which increases self heating and lowers output voltage both of which factors affect how much of the stored charge is usable.
in other words, it’s not a good idea to leave your laptop plugged in with the battery in place if the laptop battery already has a charge
Incorrect. EVERY rechargeable battery charger senses when the battery is full and stops charging. If they didn’t the batteries would burst/explode/catch fire depending on the type of battery. LiIon battery failure would occurs minutes of reaching an over charge condition.
if you need the greater performance mode while plugged in and also want best use out of your battery, remove the battery while on the grid!!!
A meaningless act and increases risk of data loss during power drops outs. See above charger operation explanation.
now, the lower the voltage the less you notice charge depletion so it’s not an important consideration on small lower voltage devices
Totally incorrect. LiIon uses a 3.6V cell stacked in series to get higher power for applications like laptops, electric cars, etc. One low voltage cell (MP3 Player, Cell phone (smart phones may stack 2 cells)) acts the same as multiple cells stacked to power a laptop. This urban myth may have originated since stacked cells in LiIon batteries need to have cell charge balancing circuitry to assure each cell charges equally to the others (not required ofr single cell LiIon batteries or for NiCd/NiMH). If there is not cell balancing some cells will end up undercharged and others overcharged over multiple charge discharge cycles. Explosion and fire will result.
I will get in touch with my contacts at microsoft and see why they do not have a “no charging mode” designed into the operating system or hardware
Superfluous. Charging is controlled in the charger hardware. Software is not involved.
that’s not the only thing but it’s most of it, I had read tech reports that informed me the battery is time depleted and that’s true but not nearly as important as charge depletion
Correct terminology is cell leakage or self discharge. LiIon is one of the battery chemistries less subject to self discharge. NiCd is the worst (days-weeks), NiMH (Month) is better and the newer NiMH type are much better (pushing a year). LiIon still leads the pack.
for time depletion the sony vgp-bps9 battery loses 20 percent of it’s capacity every year, but only if it’s at full charge! A battery will lose it’s charge regardless of state of charge. It is recommended by the professionals to keep any battery full charged for storage.
it depletes less over time according to the level of charge!!!
in other words, the longer the battery enjoys full charge the shorter the duty cycle!!!!! (counter intuitive and an opposite effect when compared to wet cells, I don’t know about nicads though)
Any sony vgp-bps9 battery has less to loose if it is not charged so storing partially charged batteries does not buy you anything. Storage out of a device helps extend charge shelf life because all devices made today never turn off. They always have keep alive circuitry running for internal clocks.
my batteries seem to last about a year every time and I just found out, this is because they are ALWAYS charged or always being charged!!!
Incorrect the worst degradation to LiIon is from deep discharge cycles. Never let LiIon get below 50% charge, irreversible chemical reactions occur.
so my sony laptop battery is always being time depleted to the fullest and charge depleted constantly
Congratulations. The battery manufactures like people to trash batteries as fast as possible. Full discharge was recommended for early NiCd to prevent formations of large moleculesls (vs smaller molecules that hold more energy). This was called memory though that term is incorrectly used for many similar effects. Newer NiCd and NiMH do not exhibit this problem. LiIon should not be discharged below 50%. I try to keep my laptop above 80%.
My laptop and small gadget LiIon batteries are all over 3 years old and still provide the same life as when new.”