ThunderVolt
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v1.1.38 · Adaptive Mode now learns your calendar
97 Battery Health

Your Mac.
Your battery.
Your rules.

ThunderVolt controls your charging at the hardware level — automatically, intelligently, every 60 seconds.

Start 7-Day Free Trial → See Features

From $2.99/mo · Apple-notarized · macOS 14+

Health
97%
Limit
80%
Cycles
238

The Reality

Most MacBooks lose 20% battery capacity within 2 years.

Every charge cycle above 80% accelerates electrochemical aging. macOS caps charging at 80% — but only sometimes, only manually, and never intelligently. ThunderVolt does it all, at the firmware level, automatically.

20%
Average capacity lost in the first two years of ownership.
10k+
Mac users protecting their battery with ThunderVolt today.
0
Bytes of battery data sent to any server, ever.

macOS limits stop at 80%.
ThunderVolt controls the whole picture.

Six purpose-built systems working together — from the SMC up to your calendar. No tweaks, no terminal, no compromises.

01

Adaptive Mode

Reads thermal state, time of day, and your calendar — then picks the right charge ceiling automatically. No manual toggling. No guesswork.

02

Discharge Mode

Drain to your target percentage while plugged in. Ideal for prepping your Mac before a long meeting or travel — no need to unplug and wait.

03

BMS Calibration

Periodic full-cycle calibration keeps the battery management system honest. Uses 6-signal scoring to detect when your BMS needs recalibration — no more drifting health readings.

04

Thermal Guard

Pauses charging when your Mac runs hot — the single biggest killer of lithium-ion longevity. Monitors CPU proximity, battery, and ambient sensors in real time.

05

Live Power Flow

Watch exactly how many watts are going into your Mac in real time. Monitor AC adapter draw, battery charge rate, and system consumption — all from the menu bar.

06

Companion Apps

Control your Mac's charging from your iPhone or wrist. Native iOS and watchOS apps with push notifications, remote mode switching, and live power flow.

Deep Dive
How Adaptive Mode works
Adaptive Mode reads three signals simultaneously — thermal sensors, your calendar, and the time of day — then adjusts your charge ceiling every 60 seconds. Hot desk? Drops to 65%. Midnight? Holds at 80%. Flight at 7am? Charges to 100% two hours before departure. No other battery app reads all three.
  • SMC-level writes every 60 seconds — firmware enforcement, not software approximation
  • Thermal hysteresis prevents oscillation when temperature hovers near thresholds
  • Calendar integration via EventKit — airport codes, flight numbers, travel time blocks
  • Override with one tap from menu bar, iPhone, or Watch

Everywhere you are

Your Mac battery,
on every screen you own.

One battery brain. Three glass surfaces. Adjust limits, peek at health, override modes — from whichever device is closest.

On your Mac

The control room.

Live charge gauge, slider for instant overrides, scheduled rules, and a thermal heatmap — all in a single menu bar app under 12 MB.

  • Menu-bar app, no dock icon
  • SMC writes every 60 seconds
  • Scriptable via Shortcuts & CLI
ThunderVolt · Menu Bar

Charge Limit

Adaptive · Active
80%
205080100
Cycles
238
Health
97%
9:41
9:41
Tuesday, October 14
THUNDERVOLT now
Adaptive Mode adjusted
Limit lowered to 65% · CPU 78°C, heat protection active until temperatures cool.
On your iPhone

Quiet alerts that matter.

Notifications when Adaptive Mode shifts gears. Tap to override, swipe to dismiss, never spam. A full charge-control interface lives one tap deeper.

  • Native iOS app, push notifications
  • Remote-trigger one-tap modes
  • End-to-end encrypted handoff
On your Apple Watch

A glance is enough.

Complication shows the live charge ceiling. A force-touch flips between Travel, Overnight, and Adaptive. The shortest path between you and your battery.

  • Ring complication for every face
  • Force-touch mode switcher
  • Haptic alert on thermal events
0%
Charge Limit

Why ThunderVolt

Other apps set a limit.
ThunderVolt sets the strategy.

Hardware-level control

We write directly to the SMC — not a software approximation. Your charge limit is enforced at the firmware level, every 60 seconds, even if macOS tries to override it.

Intelligent, not just manual

Adaptive Mode reads thermal state, calendar, and time of day — then picks the right ceiling automatically. No other battery app reads all three.

Your whole Apple ecosystem

Native apps on Mac, iPhone, and Apple Watch. One battery brain, three glass surfaces. Built for every screen you actually own.

Apple notarized & sandboxed
Battery data never leaves your Mac
Universal binary — Intel + Apple silicon
Works offline forever
Shortcuts & CLI support
Free forever for 1 Mac, 1 limit

ThunderVolt Pro

Everything free gives you.
Plus the real intelligence.

Sub-80% precision limits, AI health forecasting, iPhone & Watch remote control, calendar-aware charging, and fleet management.

Most Popular
Sub-80% Precision Limits
Apple's native limiter stops at 80%. ThunderVolt Pro goes all the way down — Storage Mode locks at 50% for long-term shelf storage, or dial in any custom threshold from 20% to 100%.
  • 20–100% custom range — finer control than standard battery utilities
  • 50% Storage Mode — purpose-built for long-term shelf storage
  • Sailing band / Hysteresis buffer — eliminates charge cycling
  • Discharge to target % while plugged in
AI Coach & Forecasting
Real-time degradation rate (−%/month), 12-month health forecast, and proactive scheduling suggestions based on your charging patterns.
  • Real-time degradation rate
  • 12-month health forecast & replacement quarter
  • Pattern detection — spots overnight charging habits
  • Weekly Health Report every Sunday
Smart Context — Travel Days
Reads your calendar. Detected a flight? Auto-charges to 100% tonight, drops back after you land. No other app does this.
  • EventKit travel day detection
  • Auto-charges to 100% before flights
  • Returns to limit after landing — automatically
  • Push notification: "Charging for your trip"
Remote Control (iPhone & Watch)
Full charge management from your wrist or phone — limits, modes, sailing band, discharge, and live power flow. Apple's limiter is Mac-only. ThunderVolt follows you everywhere.
  • Set charge limit (20–100%) from iPhone or Watch
  • Toggle Storage Mode, Apple Mode, Smart Context remotely
  • Sailing Mode control — switch band preset from your wrist
  • Live power flow — AC watts & battery charge/drain
Pro Charge Scheduler
Per-day rules, one-time overrides, and recurring schedules. Hold at 80% overnight and top up to 100% before your alarm — automatically.
  • Per-day scheduling with custom limits per time block
  • One-time overrides for travel days
  • Recurring weekly schedules that persist
  • Integrates with Adaptive Mode for calendar-aware scheduling
Fleet Management
Manage battery policies across 2–3 Macs from a single dashboard. Ideal for power users with multiple machines.
  • Unified dashboard for all your Macs
  • Bulk policy push — set limits across devices at once
  • Per-device health reports and degradation tracking
  • Sync settings via private iCloud
Start 7-Day Free Trial → Download Free

$2.99/mo · $14.99/yr · $39.99 lifetime

Free
$0
  • ✓ 1 Mac
  • ✓ 80–100% limits
  • ✓ Menu bar app
  • ✗ Adaptive Mode
  • ✗ AI Coach
  • ✗ iPhone & Watch
  • ✗ Smart Context
Download Free
Pro Monthly
$2.99/mo
  • ✓ 2–3 Macs
  • ✓ 20–100% limits
  • ✓ Adaptive Mode
  • ✓ AI Coach
  • ✓ iPhone & Watch
  • ✓ Smart Context
  • ✓ Fleet Management
Start 7-Day Free Trial
Pro Yearly
$14.99/yr
  • ✓ 2–3 Macs
  • ✓ 20–100% limits
  • ✓ Adaptive Mode
  • ✓ AI Coach
  • ✓ iPhone & Watch
  • ✓ Smart Context
  • ✓ Fleet Management
Start 7-Day Free Trial
Lifetime
$39.99 once
  • ✓ 2–3 Macs
  • ✓ 20–100% limits
  • ✓ Adaptive Mode
  • ✓ AI Coach
  • ✓ iPhone & Watch
  • ✓ Smart Context
  • ✓ Fleet Management
Buy Now

10,000+ Mac batteries protected

Your Mac's battery
deserves better.

Free for one Mac. From $2.99/mo for the whole ecosystem. Seven-day trial. No card on file. Cancel anytime.

Start 7-Day Free Trial → Download Free
Apple Notarized Privacy First Hardware-Level Works Offline 10,000+ Mac Users

$2.99/mo · $14.99/yr · $39.99 lifetime

Common Questions

Before you ask.

Yes. ThunderVolt is notarized, signed, and removable at any time. Uninstall and charging returns to macOS defaults with no residue.
Yes, including Smart System Mode on supported macOS versions. Universal binary — M1, M2, M3, M4, and Intel, no Rosetta required.
ThunderVolt works with native macOS charge controls and adds advanced features when needed. On macOS 26.4+, it defaults to System Bridge Mode — syncing with Apple's slider for zero conflicts.
ThunderVolt adds automation, sub-80% limits, forecasting, companion apps, and advanced protection modes. macOS only offers an 80–100% slider with no scheduling or remote access.
Yes. The daemon is fully removed on uninstall and charging immediately returns to macOS defaults.
ThunderVolt does not modify battery firmware. It only controls when charging starts and stops — the same thing macOS does natively.
Battery data stays local unless you enable sync features. Cross-device sync uses private iCloud — nothing is sent to ThunderVolt servers.
Yes, 7 days. No credit card required. The trial starts automatically when you open the app.
Get In Touch

We're here to help.

Email Support
Questions, billing, or feature requests — drop us a line.
Typically within 24 hours
support@thundervolt.app
Bug Reports
Found something broken? Tell us exactly what happened.
Include your macOS version and Mac model
Report a Bug