iPhone 16 Plus Battery Draining Fast - How to Fix It

⚠️ Before You Start

First, understand what "normal" battery drain looks like on the iPhone 16 Plus so you can tell if there is actually a problem:

• Normal daily use: The iPhone 16 Plus should last 12-16 hours of mixed use (web browsing, social media, messaging, calls, some streaming) before reaching 20%. Apple rates it at up to 27 hours of video playback.
• Normal standby drain: You should lose no more than 1-3% per hour on standby with the screen off. Losing more than 5% per hour on standby indicates a problem.
• After an iOS update: Battery drain is expected for 24-48 hours after updating iOS. The phone re-indexes Spotlight, Photos, and other databases in the background. Wait two days before troubleshooting.
• After restoring from backup: Similar to updates, restoring from iCloud or a computer backup triggers heavy background processing. Give it 48 hours.
• New phone setup: A brand new iPhone 16 Plus may drain faster for the first week as it syncs iCloud Photos, downloads apps, and indexes content. This is temporary.

🔧 What You Need

All fixes in this guide are free software adjustments. No tools required. If your battery health is degraded (Step 1), you may need a replacement battery ($69-99). Optional accessories that help extend battery life:

• MagSafe battery pack — for extending battery life on the go. Shop MagSafe battery packs on Amazon
• 20W+ USB-C charger — fast top-ups during the day. Shop fast chargers on Amazon

🛠️ Step-by-Step Fixes

Step 1: Check Battery Health

The first thing to check is whether the battery itself is degraded. A worn-out battery cannot hold its full charge regardless of software settings.

1. Go to Settings → Battery → Battery Health & Charging.
2. Check Maximum Capacity. This shows what percentage of the original capacity remains.
3. 100-90%: Battery is healthy. The drain problem is software or usage related — continue to Step 2.
4. 89-80%: Battery is aging. You will notice reduced battery life, but software fixes can still help significantly.
5. Below 80%: Battery is degraded and Apple recommends replacement. You may see a "Service" message. At this point, no software fix will fully restore battery life — the battery needs to be physically replaced.

Also check the Cycle Count (if displayed). Lithium-ion batteries are rated for approximately 500 full charge cycles before significant degradation.

Step 2: Find the Apps Draining Your Battery

One misbehaving app can drain 30-50% of your battery in a few hours. Here is how to find it:

1. Go to Settings → Battery.
2. Scroll down to the Battery Usage by App section.
3. Toggle between Last 24 Hours and Last 10 Days to see patterns.
4. Tap Show Activity to see on-screen vs. background usage for each app.
5. Look for red flags:
   • Any single app using more than 25% in 24 hours.
   • High "Background Activity" time for apps you rarely open.
   • Apps you don't recognize using significant battery.
6. For offending apps: force close them, disable Background App Refresh (Step 3), or delete and reinstall them to fix potential bugs.

Known battery hogs: TikTok, Instagram, Snapchat, Facebook, YouTube, Google Maps, Waze, Spotify (streaming with screen on), and most games.

Step 3: Disable Background App Refresh

Background App Refresh allows apps to fetch new data even when you are not using them. Every refresh wakes the CPU, uses network data, and drains battery.

1. Go to Settings → General → Background App Refresh.
2. At the top, tap Background App Refresh and select Off to disable it for all apps, or select Wi-Fi to only allow refreshing on Wi-Fi (saves cellular battery).
3. Alternatively, go through the list and disable it for specific apps you don't need real-time updates from: games, shopping apps, news aggregators, and social media.
4. Keep it enabled for apps that benefit from it: email, weather, calendar, and messaging apps.

This single change can improve battery life by 15-30% depending on how many apps had it enabled.

Step 4: Optimize Location Services

GPS is one of the most power-hungry sensors in your phone. Many apps request location access that they don't truly need.

1. Go to Settings → Privacy & Security → Location Services.
2. Review each app. For every app, select the most restrictive option that still allows it to function:
   • Never: Best for apps that don't need location (games, calculators, etc.)
   • While Using: Best for maps, weather, ride-sharing apps.
   • Always: Only necessary for fitness trackers, Find My, and family safety apps.
3. Scroll to the bottom and tap System Services. Turn off:
   • iPhone Analytics
   • Routing & Traffic
   • Improve Maps
   • Significant Locations (optional — used for commute suggestions)

Step 5: Adjust Display and Connectivity Settings

The display and wireless radios are the two biggest battery consumers. Small adjustments have a large cumulative effect.

1. Disable Always-On Display: Settings → Display & Brightness → Always On Display → Off. This alone can save 10-15% per day.
2. Enable Auto-Brightness: Settings → Accessibility → Display & Text Size → Auto-Brightness → On. This dims the display in low light, saving power.
3. Reduce Auto-Lock time: Settings → Display & Brightness → Auto-Lock → 30 Seconds. The sooner the screen turns off, the less battery it uses.
4. Use Wi-Fi over cellular: Wi-Fi uses significantly less power than 4G/5G. Connect to Wi-Fi whenever available.
5. Switch 5G to LTE: Settings → Cellular → Cellular Data Options → Voice & Data → LTE. In areas with weak 5G, the radio works overtime searching for signal, draining battery rapidly.
6. Disable unnecessary notifications: Settings → Notifications. Every notification wakes the screen and plays a sound. Disable notifications for non-essential apps.

Step 6: Advanced Battery Saving Measures

If the basics above haven't solved the problem, try these deeper fixes:

1. Disable Push email: Go to Settings → Mail → Accounts → Fetch New Data. Switch from Push to Fetch every 15 or 30 minutes, or set to Manual. Push email keeps a constant connection to the mail server.
2. Turn off Raise to Wake: Settings → Display & Brightness → Raise to Wake → Off. This prevents the screen from turning on every time you pick up the phone.
3. Disable iCloud Photos syncing on cellular: Settings → Photos → Cellular Data → Off. Large photo libraries can sync continuously over cellular, draining both battery and data.
4. Reset all settings: Settings → General → Transfer or Reset iPhone → Reset → Reset All Settings. This resets all preferences without erasing data. It can fix stuck processes and corrupted settings causing battery drain.
5. Force restart: Press Volume Up, Volume Down, then hold Side button until Apple logo appears. A fresh restart kills zombie processes that may be running in the background.
6. Check for iOS update: Settings → General → Software Update. Apple regularly patches battery drain bugs. Always keep iOS up to date.

💡 Pro Tips

• Enable Optimized Battery Charging: Settings → Battery → Battery Health & Charging → Optimized Battery Charging → On. This learns your daily routine and delays charging past 80% until you need to use the phone, reducing battery wear over time.
• Use Low Power Mode strategically: You don't have to wait until 20%. Enable Low Power Mode at any time from Settings → Battery or add it to Control Center for quick access. It extends battery life by 1-3 hours.
• Dark Mode saves battery on OLED: The iPhone 16 Plus has an OLED display where black pixels are actually turned off. Using Dark Mode (Settings → Display & Brightness → Dark) saves meaningful battery on screens with dark backgrounds.
• Widgets drain battery: Home screen widgets that refresh frequently (weather, stocks, news) continuously wake the CPU. Remove widgets you don't check regularly: long-press the home screen, tap the minus icon on unnecessary widgets.
• Weak signal = fast drain: If you are in an area with poor cellular reception (1 bar), your phone boosts its radio power to maintain connection, draining battery much faster. Enable Airplane Mode in no-service areas, or use Wi-Fi Calling to reduce cellular radio usage.
• Keep your phone cool: High temperatures accelerate battery drain and battery degradation. Avoid leaving the phone in direct sunlight, hot cars, or under pillows while charging. See our iPhone 16 Plus overheating guide for details.

🛠️ Need Professional Help?

If you have tried all the software optimizations above and your iPhone 16 Plus still drains abnormally fast, the battery itself is likely degraded or defective.

When to replace the battery:

• Battery Health shows below 80% Maximum Capacity.
• The phone dies at 20-30% remaining charge.
• Battery percentage jumps erratically (goes from 50% to 20% suddenly).
• The phone barely lasts half a day with light use.
• The phone or back glass feels warm even when idle (possible swollen battery).

Replacement costs:

• Apple (out-of-warranty): $99
• Apple (with AppleCare+): $0 if battery is below 80% capacity
• Third-party repair: $59-79 (same or next day service)

PC Medics of NJ offers iPhone 16 Plus battery replacement with genuine-quality cells and a 90-day warranty. Most battery replacements are completed the same day.

Call (856) 914-1074 for a free battery diagnostic, or use our mail-in repair service from anywhere in the US. Turnaround is typically 3-5 business days for mail-in orders.