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-as of [10 MARCH 2025]-
*FULL CHARGE CAPACITY* —>
-6855 mAh-
(service recommended)
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-”BATTERY”-
(the [macOS preference pane])
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*OPEN THE [BATTERY] TAB* —>
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*click the “grayed out i button”* —>
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*CLICKING THE “SERVICE OPTIONS” BUTTON OPENS THIS URL IN A NEW [BROWSER TAB]* —>
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*CLICKING THE “LEARN MORE” BUTTON OPENS THIS URL IN A NEW [BROWSER TAB]* —>
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Mac laptop batteries use lithium-ion technology.
Lithium-ion batteries charge quickly, are long-lasting, and currently provide the best technology to power your computer.
All rechargeable batteries are consumable components that become less effective as they get older—and their age isn’t determined only by time.
A battery’s lifespan depends on its chemical age, which is affected by factors such as its temperature history and charging pattern.
As your laptop’s battery ages chemically, its charging capacity gets smaller.
With these tips for maximizing battery performance, you can get the most out of all your Apple devices.
And with battery health management, your Mac laptop can take battery optimization even further.
The battery health management feature in macOS 10.15.5 is designed to improve your battery’s lifespan by reducing the rate at which it chemically ages.
The feature does this by monitoring your battery’s temperature history and its charging patterns.
Based on the measurements that it collects, battery health management may reduce your battery’s maximum charge when in this mode.
This happens as needed to ensure that your battery charges to a level that’s optimized for your usage—reducing wear on the battery, and slowing its chemical aging.
Battery health management also uses the measurements to calculate when your battery needs service.
While battery health management benefits your battery’s long-term lifespan, it can also reduce the amount of time your Mac runs on one battery charge when capacity limits are applied.
If your priority is making your Mac laptop last as long as possible before recharging, you can turn the feature off.
When battery health management is turned on, your battery’s maximum charging capacity might be limited.
Although the feature is designed to improve your battery’s lifespan, the limited maximum capacity might update your battery status menu to indicate a need for service.
Your Mac calculates when to recommend service for your battery based on battery health management being continuously enabled.
Battery health management is on by default when you buy a new Mac laptop with macOS 10.15.5 or later, or after you upgrade to macOS 10.15.5 or later on a Mac laptop with Thunderbolt 3 ports.
If you want to turn off battery health management on a Mac laptop with an Intel processor, follow these steps:
Choose System Preferences from the Apple menu , then click Battery.
Click Battery in the sidebar, then click Battery Health.
Deselect “Manage battery longevity”.
Battery System Preferences Battery Health modal window
Click Turn Off, then click OK.
“Are you sure you want to turn off battery health management” popup window
Note that turning this feature off might reduce your battery’s lifespan.
If you feel that your battery isn’t lasting as long as it should, you can learn about getting service for your Mac laptop.
Published Date: April 24, 2024
support.apple.com /en-us/102588
About battery health management in Mac laptops –
Apple Support
6-8 minutes
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*LAST 24 HOURS* —>
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*LAST 10 DAYS* —>
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*CLICK THE [OPTIONS] BUTTON* —>
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*CLICK THE “? BUTTON” TO OPEN THIS “FLOATING WINDOW”* —>
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*OPEN “APPLE MENU” IN SYSTEM’S [TOP MENU BAR]* —>
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-HOLD DOWN [OPTION] + SELECT “SYSTEM INFORMATION”-
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*IN THE “HARDWARE SECTION”, CLICK THE “POWER” TAB* —>
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*BATTERY INFORMATION* —>
Model Information:
Serial Number:
F5D12555ZSFK7LQCF
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Manufacturer:
DSY
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Device Name:
bq40z651
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Pack Lot Code:
0
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PCB Lot Code:
0
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Firmware Version:
0b00
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Hardware Revision:
300
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Cell Revision:
809
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Charge Information:
The battery’s charge is below the warning level:
No
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Fully Charged:
Yes
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Charging:
No
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Full Charge Capacity (mAh):
6855
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State of Charge (%):
100
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Health Information:
Cycle Count:
761
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Condition:
Service Recommended
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-“FULL CHARGE CAPACITY” REFLECTS THE CURRENT MAXIMUM AMOUNT OF “POWER” THAT YOUR BATTERY CAN HOLD-
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-IT WILL ALWAYS BE LESS THAN THE “DESIGN CAPACITY”, WHICH IS THE “ORIGINAL CAPACITY”-
(THIS IS NOT LISTED)
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-WHEN “CYCLE COUNT” REACHES [1000], YOU SHOULD PROBABLY “SERVICE THE BATTERY”-
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*MACBOOK BATTERY LIFE*
(5 1/2 hours?)
(depends on how hard your computer is working)
*fast charge* vs *trickle charge*
(‘fast charge’ has higher ‘charge voltage’ + ‘amperage’)
‘fast charge’ is used when battery is at less than 80%
(then the weaker/longer ‘trickle charge’ is used)
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(how long does it take to fully charge a ‘dead macbook battery’?)
(apple claims it takes 2 hours to charge battery from 0% to 80%)
(apple claims it takes 1 hour to charge battery from 50% to 80%)
(then 2 hours to charge from 80% to 100%)
(3 hours to go from 50% to 100%)
(~4 HOURS TO GO FROM 0% TO 100%)
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Trickle charging means charging a fully charged battery at a rate equal to its self-discharge rate, thus enabling the battery to remain at its fully charged level;
this state occurs almost exclusively when the battery is not loaded, as trickle charging will not keep a battery charged if current is being drawn by a load
A battery under continuous float voltage charging is said to be float-charging
For lead-acid batteries under no load float charging (such as in SLI batteries), trickle charging happens naturally at the end-of-charge, when the lead-acid battery internal resistance to the charging current increases enough to reduce additional charging current to a trickle, hence the name.
In such cases, the trickle charging equals the energy expended by the lead-acid battery splitting the water in the electrolyte into hydrogen and oxygen gases
Other battery chemistries, such as lithium-ion battery technology, cannot be safely trickle charged.
In that case, supervisory circuits (sometimes called battery management system) adjust electrical conditions during charging to match the requirements of the battery chemistry
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*for ‘Li-ion batteries’ generally, (and for some variants especially), failure to accommodate the limitations of the (electro-)chemistry of a ‘cell’, with regard to ‘trickle charging’ after reaching a ‘fully charged state’, can lead to ‘over-heating’ +, possibly to ‘fire’ or ‘explosion’*
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*SKETCHES*
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