Živjo!

Pred enim mesecem sem jamral, da imam pri 10 mesecev staremu MBPju zanič baterijo po 27-ih polnilnih ciklih.

Baterijo so mi na iStyle zamenjali pod garancijo, tako da je bilo to brez problemov.

Sedaj imam novo baterijo cca. 14 dni, do sedaj sem prenosnik rabil 3x na baterijo, od tega sem ga 2x spraznil do konca (do opozorila) ter potem napolnil spet do konca.

Stanje baterije:

Health: 97%
Cycles: 3
Charge: 99%

Predvsem me zanima tisti health... kako to, da je iz 99% v 14 dneh padel na 97%? Ne bi rad imel enakega problema, kot sem ga že enkrat in bi rad rešil laptop še pod garancijo, ki mi poteče 20. februarja ... Če ima kdo kakšno idejo, naj prosim pove.

LP,
Tadej

Po zgolj treh ciklih, bateriji ne bi smelo zdravlje tako opešati, če je bila seveda nova! Če pa se jim je na servisu valjala po kakšnih predalih že nekaj let, potem pa ni tako presenetljivo.
Kot je bilo že napisano, litijevim akumulatorjem škodi le toplota in njihova kapaciteta predvidljivo in konstantno pada z njihovo starostjo. Povprečen litijev akumulator naj bi imel življensko dobo, tam nekje, tri do pet let, ko jim kapaciteta upade na 80% prvotne in takrat se smatra akumulator za zanič.
Kako akumulator polneš nima velikega vpliva na njegovo zdravje saj za pravilno polnjenje skrbi vgarajena elektronika, naj pa se jih ne bi praznilo pod 30% kapacitete in naj se jih polni čimbolj pogosto, torej na štrom tudi če ni prazen! Kar pa je popolnoma nasprotno starin nikljevim akumulatorjem, ki boh ne daj, da bi ga polnil večkrat ne da bi ga vsakič popolnoma izpraznil.

jaz mam na svojem 2 meseca starem mbp (starejši model) po 63 polnjenjih še 92% prvotne kapacitete... je to normalno al mam tudi jaz problem?

ni lih normalno ker jst mam na macbooku sledeče podatke

super

Res pa je da ga imam jaz 95% časa priklopljenega na polnilec in to daje bateriji življenje. Če pa si ga kaj dostikrat praznil pa je stvar drugačna...vsaj predvidevam tako

hehe... drugi pa pravijo da je to smrt za baterijo če je ne polniš in ne prazniš... pa eni pravijo da samo do 30% izpraznit eni da jo je treba čisto! pa da jo met vedno veni ko ni potrebna ali drugi ki pravijo da jo čimveč uporablat...

mislim meni je itak vseeno ker če mi bo šla po gobe prej ko v enem letu bom zahteval novo! ampak vseeno bi se rad preventivno izognil temu zato bi blo super če bi nekdo povedal kaj je res najbolje za batrijo?!

klemn je napisal/a:

Res pa je da ga imam jaz 95% časa priklopljenega na polnilec in to daje bateriji življenje. Če pa si ga kaj dostikrat praznil pa je stvar drugačna...vsaj predvidevam tako

pri tem vlogo itak igrajo cikli...on jih v 2 mescih ni naštancal 250 (vsak dan 4 cikle)

semnicki je napisal/a:

hehe... drugi pa pravijo da je to smrt za baterijo če je ne polniš in ne prazniš... pa eni pravijo da samo do 30% izpraznit eni da jo je treba čisto! pa da jo met vedno veni ko ni potrebna ali drugi ki pravijo da jo čimveč uporablat... mislim meni je itak vseeno ker če mi bo šla po gobe prej ko v enem letu bom zahteval novo! ampak vseeno bi se rad preventivno izognil temu zato bi blo super če bi nekdo povedal kaj je res najbolje za batrijo?!

Jah teh raztlag je itak milijon Jaz zadevo razumem tak (nekaj izkušenj iz modelarstva). Baterija je omejena s številom ciklov, torej manj ciklov daljša živ. doba, je pa fajn v nekem časovnem obdobju vseeno ciklirati da se baterija ne "poleni" (npr.: 2 na mesec). Baterija bo pa cca po 3-5 letih crknila tudi sama od sebe, ne glede na št. narejenih ciklov zaradi dotrajanosti materiala oz. "notranjih ciklov". Se pa strinjam tudi s tem, da toplota slabo vpliva na baterijo in zato te baterije v mbp-jih tut prej crkujejo. Vse ostalo je pomojem pri današnji tehnologiji ni relevantno (do kolko praznit, ven jemat-mogoče zaradi temp. edino ...)

torej nič ne pomaga da maš hlajenje spodnega dela macbook pro-ja
razen tega da ti temperature padejo pb. 10ºC

jah zanimivo je da imajo prebleme z baterijo v glavnem tisti z mbpji za mbji pa ne, tak da temparatura očitno res igra vlogo

Moja baterija na crnem MacBooku je v takem stanju...

Dex je napisal/a:

semnicki je napisal/a: hehe... drugi pa pravijo da je to smrt za baterijo če je ne polniš in ne prazniš... pa eni pravijo da samo do 30% izpraznit eni da jo je treba čisto! pa da jo met vedno veni ko ni potrebna ali drugi ki pravijo da jo čimveč uporablat... Jah teh raztlag je itak milijon Jaz zadevo razumem tak (nekaj izkušenj iz modelarstva). Baterija je omejena s številom ciklov, torej manj ciklov daljša živ. doba, je pa fajn v nekem časovnem obdobju vseeno ciklirati da se baterija ne "poleni" (npr.: 2 na mesec). Baterija bo pa cca po 3-5 letih crknila tudi sama od sebe, ne glede na št. narejenih ciklov zaradi dotrajanosti materiala oz. "notranjih ciklov". Se pa strinjam tudi s tem, da toplota slabo vpliva na baterijo in zato te baterije v mbp-jih tut prej crkujejo. Vse ostalo je pomojem pri današnji tehnologiji ni relevantno (do kolko praznit, ven jemat-mogoče zaradi temp. edino ...)

Pravzaprav je razlaga le ena, saj je tudi tehnologija le ena, če pa se vrjame vsakemu nediskriminatorno, potem pa seveda, da je razlag toliko kot je pripovedovalcev.
Kdor želi se sam podučiti kako in kaj pri litijevih akumulatorjih (Li-ion, Li-poly,...) mora le prebrati napisano na Wikipedii in verjet strokovni literaturi.

Ker pa so nekateri očitno preleni, da bi poiskali in prebrali bom copy-paste z Wiki dal kle:

Li-ion:

Guidelines for prolonging Li-ion battery life
Like all rechargeable batteries, lithium-ion batteries should be charged early and often. However, if they are not used for a long time, they should be brought to a charge level of around 40%–60%. Lithium-ion batteries should not be frequently fully discharged and recharged ("deep-cycled").
-Li-ion batteries should never be depleted to below their minimum voltage, 2.4 V to 3.0 V per cell.
-Li-ion batteries should be kept cool. Ideally they are stored in a refrigerator. Aging will take its toll much faster at high temperatures. The high temperatures found in cars cause lithium-ion batteries to degrade rapidly.
-Li-ion batteries should not be frozen (most lithium-ion battery electrolytes freeze at approximately −40 °C; however, this is much colder than the lowest temperature reached by household freezers).
-Li-ion batteries should be bought only when needed, because the aging process begins as soon as the battery is manufactured.
When using a notebook computer running from fixed line power over extended periods, the battery should be removed, and stored in a cool place so that it is not affected by the heat produced by the computer.

Storage temperature and charge
Storing a Li-ion battery at the correct temperature and charge makes all the difference in maintaining its storage capacity. The following table shows the amount of permanent capacity loss that will occur after storage at a given charge level and temperature.

Permanent Capacity Loss versus Storage Conditions:

Storage Temperature 40% Charge 100% Charge
0 °C (32 °F) 2% loss after 1 year 6% loss after 1 year
25 °C (77 °F) 4% loss after 1 year 20% loss after 1 year
40 °C (104 °F) 15% loss after 1 year 35% loss after 1 year
60 °C (140 °F) 25% loss after 1 year 40% loss after 3 months
Source: BatteryUniversity.com

It is significantly beneficial to avoid storing a lithium-ion battery at full charge. A Li-ion battery stored at 40% charge will last many times longer than one stored at 100% charge, particularly at higher temperatures.
If a Li-ion battery is stored with too low a charge, there is a risk of allowing the charge to drop below the battery's low-voltage threshold, resulting in an unrecoverable dead battery. Once the charge has dropped to this level, recharging it can be dangerous. Some batteries therefore feature an internal safety circuit which will prevent charging in this state, and the battery will be for all practical purposes dead.[citation needed]
In circumstances where a second Li-ion battery is available for a given device, it is recommended that the unused battery be discharged to 40% and placed in the refrigerator to prolong its shelf life. While the battery can be used or charged immediately, some Li-ion batteries will provide more energy when brought to room temperature.

Prolonging Life in Multiple Cells Through Cell Balancing
Analog front ends that balance cells and eliminate mismatches of cells in series or parallel significantly improve battery efficiency and increase the overall pack capacity. As the number of cells and load currents increase, the potential for mismatch also increases. There are two kinds of mismatch in the pack: State-of-Charge (SOC) and capacity/energy (C/E) mismatch. Though the SOC mismatch is more common, each problem limits the pack capacity (mAh) to the capacity of the weakest cell.

It is important to recognize that the cell mismatch results more from limitations in process control and inspection than from variations inherent in the Lithium Ion chemistry. The use of cell balancing can improve the performance of series connected Li-ion Cells by addressing both SOC and C/E issues. SOC mismatch can be remedied by balancing the cell during an initial conditioning period and subsequently only during the charge phase. C/E mismatch remedies are more difficult to implement and harder to measure and require balancing during both charge and discharge periods.

Cell Balancing
Cell balancing is defined as the application of differential currents to individual cells (or combinations of cells) in a series string. Normally, of course, cells in a series string receive identical currents. A battery pack requires additional components and circuitry to achieve cell balancing. However, the use of a fully integrated analog front end for cell balancing] reduces the required external components to just balancing resistors.
This type of solution eliminates the need for discrete capacitors, diodes and most other resistors to achieve balance.
Battery pack cells are balanced when all the cells in the battery pack meet two conditions:
If all cells have the same capacity, then they are balanced when they have the same State of Charge (SOC.) In this case, the Open Circuit Voltage (OCV) is a good measure of the SOC. If, in an out of balance pack, all cells can be differentially charged to full capacity (balanced), then they will subsequently cycle normally without any additional adjustments. This is mostly a one shot fix.
If the cells have different capacities, they are also considered balanced when the SOC is the same. But, since SOC is a relative measure, the absolute amount of capacity for each cell is different. To keep the cells with different capacities at the same SOC, cell balancing must provide differential amounts of current to cells in the series string during both charge and discharge on every cycle.

Pa še del o staranju...

Shelf life
A unique drawback of the Li-ion battery is that its service life is dependent upon aging (shelf life). From time of manufacturing, regardless of whether it was charged or the number of charge/discharge cycles, the battery will decline slowly and predictably in "capacity". This means an older battery will not last as long as a new battery due solely to its age, unlike other batteries. This is due to an increase in internal resistance, which affects its ability to deliver current, thus the problem is more pronounced in high-current applications than low. This drawback is not widely published. However, as this capacity decreases over time, the time required to charge it also decreases proportionally. Also, high charge levels and elevated temperatures hasten permanent capacity loss for Lithium ion batteries. This heat is caused by the traditional carbon anode, which has been replaced with good results by Lithium titanate. Lithium titanate has been experimentally shown to drastically reduce the degenerative effects associated with charging including expansion and other factors.

At a 100% charge level, a typical Li-ion laptop battery that is full most of the time at 25 °C will irreversibly lose approximately 20% capacity per year. However, a battery in a poorly ventilated laptop may be subject to a prolonged exposure to much higher temperatures, which will significantly shorten its life. Different storage temperatures produce different loss results: 6% loss at 0 °C, 20% at 25 °C, and 35% at 40 °C. When stored at 40%–60% charge level, the capacity loss is reduced to 2%, 4%, 15% at 0, 25 and 40 degrees Celsius respectively.

Pa še zdravje moje baterije: