Sources & Revision History

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Primary Sources

Where the data comes from
ChargerLAB
Lab-tested charging curves in a 25°C thermotank, screen off. The gold standard for charging speed data. When ChargerLAB has tested a device, their numbers take priority over everything else. chargerlab.com
Apple Support & Tech Specs
Official specs for battery capacity (Wh), what ships in the box, fast-charge requirements, cycle count guarantees, and battery health features. Product pages linked inline throughout the guide. support.apple.com
Digital Trends
Independent charging speed tests with mAh/minute metrics. Used to cross-check ChargerLAB data and fill gaps for devices ChargerLAB hadn't tested at publication time. digitaltrends.com
Tom's Guide / CNET / Laptop Mag
Battery life testing under standardized workloads. Used for cross-referencing Apple's claimed battery hours against real-world use patterns. tomsguide.com · cnet.com · laptopmag.com
Anker Product Documentation
Official port specs and power distribution tables for the Prime 160W 3-Port (A2687). Power split behavior confirmed against Anker's published spec sheet.
Battery University
Research-backed reference for lithium-ion chemistry: charge/discharge curves, cycle life vs. depth of discharge, temperature effects on longevity. The cycle life table in "The 80% Question" derives from this body of research. batteryuniversity.com
How Charging Times Were Calculated

ChargerLAB tests are the primary source for 0-to-50% times. Their methodology: device powered off, ambient 25°C thermotank, factory cable, charging from 0%. When a ChargerLAB test wasn't available for a specific device, times were estimated from battery capacity (Wh) and known charge curves of devices with similar batteries and chipsets.

"Stock" times use the charger Apple includes (or a 20W USB-C for iPhones, since nothing is included). "Optimal" times use the fastest charger the device actually accepts -- going higher doesn't help because the device caps its own draw.

All times are noted ±10% to account for ambient temperature, cable quality, battery health, background activity, and the reality that your phone isn't sitting in a thermotank.

The Charging Curve
Three-phase lithium-ion charge model (constant current, constant voltage, trickle)
Standard CC/CV charging protocol. Documented in Battery University and visible in every ChargerLAB charge curve graph.
"140W and 20W finish the same" above 80%
ChargerLAB charge curves show wattage converging to ~5-9W in the 80-100% phase regardless of charger rating.
iPhones
Battery capacities: 17 Pro Max (19.6 Wh), 17 Pro (16.0), 17 (14.0), 17e (15.4), 16 Pro Max (18.0), 16 Plus (18.0), 16 (13.7), 15 Pro Max (17.3), Air (12.3)
Apple Tech Specs pages and regulatory filings. Each device name in the guide links to its Apple product page.
Max wattage: 17 Pro/Pro Max accept 40W; 16 Pro Max accepts 30W; 17e and Air cap at 20W
ChargerLAB power meter tests. Apple doesn't publish max wattage for iPhones -- these are measured values.
0→50% times at 20W and optimal for each device
ChargerLAB charge tests (17 Pro Max, 17 Pro, 16 Pro Max). Digital Trends tests used to fill iPhone 17, 16 Plus, 16, 15 Pro Max. 17e and Air estimated from 20W cap + battery size.
"No charger in the box since 2020"
Apple stopped including chargers starting with iPhone 12 (October 2020). Apple product pages confirm "USB-C Charge Cable (1 m)" only.
iPads
Battery capacities: Pro 13" M4 (39.0 Wh), Pro 11" M4 (31.3), Air 13" M4 (36.6), Air 11" M4 (28.9), mini 7 (19.3)
Apple Tech Specs. Confirmed in regulatory filings (capacity in Wh listed on all iPad product pages).
All ship with 20W USB-C adapter
Apple "What's in the Box" sections on each iPad product page.
Max wattage: Pros accept ~35W, Airs accept ~31W, mini caps at ~20W
ChargerLAB power meter tests for iPad Pro M4 models. Air wattage from Digital Trends testing. Mini 7 caps at ~20W per multiple independent tests.
0→50% charging times at stock vs. optimal
ChargerLAB tests for Pro models. Air and mini times estimated from battery capacity and measured max draw rates.
MacBooks
Battery capacities: MBP 16" (100 Wh), MBP 14" (72.4), Air 15" M5 (66.5), Air 13" M5 (53.8), Neo (36.5)
Apple Tech Specs pages. MacBook battery capacities are published by Apple.
Ships-with chargers: MBP 16" gets 140W, MBP 14" gets 70-96W, Airs get 40W, Neo gets 20W
Apple "What's in the Box" sections. M5 Air adapter changed from 30-35W to 40W Dynamic Power Adapter.
Fast-charge thresholds: Airs fast-charge at ~70W, MBP 14" at 96W, MBP 16" at 140W, Neo caps at 30W
Apple Support: "Charge your Apple laptop with USB-C." Fast-charge requirement = "at least 50% in approximately 30 minutes" with specified wattage.
MacBook Air M5 now ships with 40W Dynamic Power Adapter (up from 30-35W)
Apple MacBook Air M5 product page, March 2026. The 40W Dynamic Power Adapter (USB PD 3.2, Adjustable Voltage Supply) was introduced September 2025 with iPhone 17.
macOS Tahoe 26.4 "Slow Charger" warning label in battery menu
macOS Tahoe 26.4 release notes (March 25, 2026). Orange indicator in Battery settings and menu bar. Same update added granular Charge Limit (80-100%) to macOS.
MBP 14" base M5 and 16-core Pro ship with 70W -- below 96W fast-charge threshold
Apple MacBook Pro Tech Specs: 70W adapter included with M5 base and M5 Pro (16-core). 96W with M5 Pro (20-core). 140W with all M5 Max and all 16" configs.
Wearables
Apple Watch and AirPods draw 3-7W regardless of charger
ChargerLAB power meter tests. Apple Watch charges at ~5W via magnetic puck. AirPods at ~3-5W via case. Charger wattage is irrelevant -- device draw is the bottleneck.
Battery Health
"At 45°C, lifespan is halved vs. 20°C"
Battery University: "How does elevated temperature affect the cycle life of lithium-ion?" Studies show exponential degradation above 30°C, with ~50% capacity loss acceleration at 45°C.
Fast-charging "only hits peak wattage for ~15 minutes, then throttles back"
Visible in every ChargerLAB charge curve. Peak wattage is sustained only during the CC phase (0-~45%), typically 10-20 minutes. Thermal throttling and CV transition reduce draw well before 80%.
Heat ranked as #1 degradation factor; charge speed ranked as least important
Battery University, Electrochemical Society publications. Apple's own design (aggressive thermal throttling, charge curve tapering) confirms they prioritize temperature management over charge speed.
The 80% Question
Cycle life table: 100% = 300-500 cycles, 90% = 600-1,000, 80% = 1,200-2,000, 70% = 2,400-4,000
Derived from Battery University's depth-of-discharge vs. cycle-life data for lithium cobalt oxide cells (the chemistry Apple uses). Ranges reflect variation across studies and cell quality. The "doubling per 10%" pattern is a well-documented approximation.
Optimized Battery Charging: holds at 80%, tops off before alarm
Apple Support: "About Optimized Battery Charging on your iPhone." Introduced in iOS 13 (2019). Learns daily charging routine using on-device machine learning.
Charge Limit: 80-100% in 5% steps (iOS 17+ / macOS Sequoia+)
Apple Support: "Use Charge Limit on your iPhone." iOS 17 initially offered 80% only; iOS 18 added 5% increments. macOS Sequoia added it for MacBooks; macOS Tahoe 26.4 added the same granularity.
Cold charging block below 0°C; reduced speed 0-10°C
Apple Support: "Keeping your Apple device within acceptable operating temperatures." Charging in extreme cold can permanently damage lithium-ion cells.
"USB-C means the device controls wattage, not the charger"
USB Power Delivery specification. The sink (device) negotiates voltage/current with the source (charger). A 140W charger cannot push more power than the device requests.
Cycle Counts
iPhone 15+: 1,000 cycles to 80% capacity. iPhone 14 and earlier: 500 cycles. All modern MacBooks: 1,000 cycles.
Apple Support: "About battery cycle count for Mac notebooks" and "iPhone battery and performance." The iPhone 15 upgrade from 500 to 1,000 cycles was announced at the September 2023 keynote.
Cycle definition: 100% cumulative capacity used, not plug-in events
Apple Support: "Determine battery cycle count for Mac notebooks." Apple's example: "you could use half your laptop's charge in one day, then recharge fully. If you did the same thing the next day, it would count as one charge cycle."
Anker Prime 160W 3-Port (A2687)
Port ratings: each USB-C up to 140W solo. 160W total.
Anker A2687 product listing. PD 3.1 support on all three ports (28V/5A for 140W). GaN technology, built-in display.
Power split: 1 port = 140W, 2 ports = 100W + 60W, 3 ports = 100W + 30W + 30W
Anker A2687 spec sheet, "Standard (C1 Priority)" mode. AI mode redistributes dynamically based on device demand.
That Little White Charger
Apple 5W USB Power Adapter — shipped with every iPhone from 2007 to 2019
Apple Support: "About Apple USB power adapters." A1385 (US), A1400 (EU). Discontinued with iPhone 11 (last to include a charger before removal entirely with iPhone 12).
5W charging times: iPhone 17 Pro Max ~2h+, iPad Pro 13" ~4h+, MacBook Air 15" won't charge
Calculated from battery capacity / 5W, adjusted for charge curve inefficiency. MacBook Air won't charge from 5W USB-A -- insufficient voltage for USB-C PD negotiation.
Currency

Data current as of March 2026. Covers all Apple devices available at that date, including the March 2026 hardware refresh (iPhone 17e, iPad Air M4, MacBook Air M5, MacBook Neo, MacBook Pro M5) and macOS Tahoe 26.4.

Charging times are living data -- they get updated when new ChargerLAB tests are published or Apple changes included adapters. The guide's ±10% margin accounts for the gap between lab conditions and your desk.

Revision History
March 27, 2026
Added sources page. Fixed Apple Watch fast-charging claim in wearables section.
March 26, 2026
Major update for March 2026 hardware refresh: iPhone 17e, MacBook Air M5, MacBook Neo, MacBook Pro M5. Added macOS Tahoe 26.4 Slow Charger warning and granular Charge Limit. Updated all charging tables.
February 24, 2026
Added "The 80% Question" battery health section. Added mobile-responsive layout.
February 23, 2026
Initial publication.