A charge cycle happens when you use all of the battery’s power—but that doesn’t necessarily mean in a single charge. Mid 2015) MacBook Pro (Retina, 15-inch
But you might reduce the battery's maximum charging capacity by keeping it plugged in all the time. This means that if you keep your MacBook plugged into the charger all the time, you might find that when you do decide to run it off the battery, it doesn't last nearly as long as it used to. This is why it is generally a good idea to avoid
Apple MacBook Pro 14-inch (2021) (14-inch 1TB) at Amazon for $2,259.95; MacBook Pro 2021 (14-inch) review: Price and release date. Pricey out the gate at $1,999; The 13-inch MacBook Pro didn't get The 16-inch MacBook Pro with M1 Pro or M1 Max chips offers up to 21 hours of Apple TV movie playback and up to 14 hours of wireless web surfing through its 100-watt-hour lithium-polymer battery.
Battery and Power 2. Up to 9 hours wireless web; Up to 10 hours iTunes movie playback; Up to 30 days standby time; Built‑in 38‑watt‑hour lithium‑polymer battery; 45W MagSafe 2 Power Adapter with cable management; MagSafe 2 power port; Size and Weight. Height: 0.11-0.68 inch (0.3-1.7 cm) Width: 11.8 inches (30 cm) Depth: 7.56 inches (19.
A charge cycle happens when you use all of the battery’s power – but that doesn’t necessarily mean in a single charge. Mid 2015) MacBook Pro (Retina, 15
1GB=1 billion bytes; actual formatted capacity less. Wireless web testing conducted by Apple in February 2011 using preproduction 2.7GHz dual-core Intel Core i7–based 13-inch MacBook Pro units. The wireless web test measures battery life by wirelessly browsing 25 popular websites with display brightness set to 50%. Battery and Power 2. Up to 10 hours wireless web; Up to 10 hours iTunes movie playback; Up to 30 days of standby time; Built-in 58.0-watt-hour lithium-polymer battery; 61W USB-C Power Adapter; Operating Requirements. Line voltage: 100V to 240V AC; Frequency: 50Hz to 60Hz; Operating temperature: 50° to 95° F (10° to 35° C)

The fact it indicates " Service Battery " is a good indication to have the Battery Replaced . Add to that, from what I can find >> Retina MacBook Pro 15" mid 2015 model. The theoretical capacity of this battery when new was 8755mAh. Versus" AlsoBattery Information>>Full Charge Capacity>>1711(mAh) "

Direct Firmware Upgrade or DFU mode can help to diagnose or solve this issue. Press and hold the power button for a solid twenty seconds. Release the button, wait a few seconds, and attempt to power it on again. This will force a normal boot attempt if your device was inadvertently put into DFU mode.

Battery of my MacBook is draining too fast I updated my 2016 MacBook Pro from 10.14 to 12.4 and ever since I did that my battery has become weaker by a lot and doesn't last at all, I don't know what to do

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    • macbook pro 2015 battery capacity