Yes, your phone charges slower in low power mode, but the difference is usually small

Low power mode does reduce charging speed. When you turn it on, your phone limits background activity, reduces processor speed, and dims the screen — all of which means the device draws less power overall. That lower power draw extends to the charging circuit itself. Your phone charges at a reduced rate because the system is designed to use less energy across the board.

The actual slowdown varies by phone model and manufacturer. On an iPhone, the difference might be 10 to 20 percent slower. On Android phones, it depends on the specific device and which power-saving mode you use — some phones have multiple levels. The difference is noticeable if you're watching the percentage climb, but it's not dramatic enough to add hours to a full charge in most cases.

Whether this matters depends on your situation. If you're in a hurry and need a quick top-up, turning off low power mode for 20 minutes will get you more usable battery faster. If you're charging overnight or have time to spare, the slower rate doesn't affect you at all.

Key Takeaways

  • Low power mode reduces charging speed because the phone limits power use across all systems, including the charging circuit.
  • The slowdown is typically 10 to 20 percent on most phones, not a dramatic difference in real time.
  • Turning off low power mode for 30 minutes while charging will noticeably speed up the process if you need the phone quickly.
  • Leaving low power mode on during a full overnight charge makes almost no practical difference to when your phone is ready to use.

How low power mode affects the charging circuit

Your phone's charging system has two main parts: the charger itself (the brick and cable) and the charging circuit inside the phone. The charger delivers power at a fixed rate — usually 5 watts for a standard charger, 18 watts or higher for a fast charger. The phone's internal circuit decides how much of that power to actually use.

When low power mode is on, the charging circuit throttles back. It tells the phone to accept power more slowly, the same way it tells the processor to run slower and the screen to use less brightness. This is a deliberate choice by the manufacturer to reduce heat and stress on the battery during low-power operation.

The phone is still receiving the full power from the charger, but it's not pulling all of it. Think of it like a water tap: the tap is open to full flow, but the phone has turned down the valve on its end.

When the slowdown actually matters

If you need your phone to 15 or 20 percent battery in the next 30 minutes, turn off low power mode while charging. You'll see a visible difference. The phone will charge faster, and you'll reach usable battery sooner.

If you're charging for an hour or more, the slowdown becomes less important. A phone that charges to 80 percent in 45 minutes with low power mode off might take 50 to 55 minutes with it on — not a meaningful difference if you have the time.

Overnight charging is where low power mode makes almost no practical difference. Whether it takes 6 hours or 7 hours to reach 100 percent, your phone is ready when you wake up either way.

The trade-off between speed and battery health

Charging at lower speeds is actually better for your battery's long-term health. Slower charging generates less heat, and heat is what degrades lithium batteries over time. If you charge your phone every night, using low power mode during that charge might extend the battery's lifespan by a few months.

This is a real but small benefit. You're not going to double your battery life by charging in low power mode. But if you're someone who keeps the same phone for three or four years, the difference between a battery that holds 75 percent capacity after two years and one that holds 80 percent is noticeable.

The trade-off is straightforward: slower charging now, slightly longer battery life later. For most people, that's worth it during overnight charging, but not worth it when you need the phone quickly.

Fast charging and low power mode

If your phone supports fast charging — 18 watts, 30 watts, or higher — low power mode will reduce the benefit. A phone that normally charges to 50 percent in 20 minutes might take 25 to 30 minutes with low power mode on.

Fast chargers work by pushing more power into the phone in a shorter time. Low power mode deliberately limits how much power the phone will accept, so you lose some of that speed advantage. If you bought a fast charger specifically to charge quickly, turning off low power mode when you're in a hurry makes sense.

How to charge faster without sacrificing battery health

If you want the phone to charge quickly without using low power mode, close background apps and turn off features you don't need in that moment. Disable Bluetooth, location services, and background app refresh. Turn the screen brightness down or off entirely — the screen is one of the biggest power draws on a phone.

These steps reduce the phone's power use without triggering low power mode, so the charging circuit can run at full speed while the phone itself is using less energy. You get faster charging and lower heat generation without the artificial throttling that low power mode applies.

If you're charging with a fast charger, use it with the phone in airplane mode or powered off. This is the fastest way to charge and generates the least heat, which is why it's the best option when you need battery quickly and don't need to use the phone.

Different phones, different slowdowns

Apple's low power mode on iPhones reduces charging speed noticeably but not dramatically. Samsung's power-saving mode has a similar effect. Google Pixel phones have Extreme Battery Saver, which is more aggressive and slows charging more than standard low power mode.

Some Android phones have multiple levels of power saving — standard, medium, and extreme. The more aggressive the mode, the slower the charging. If your phone has options, using a lighter power-saving mode gives you some of the battery extension without as much charging slowdown.

Check your phone's settings to see what power modes are available. The documentation that came with your phone or the manufacturer's website will tell you the specific charging impact of each mode.

Frequently Asked Questions

Does low power mode damage the charger or battery?

No. Low power mode just reduces how much power the phone pulls from the charger. The charger itself is unaffected. The battery actually experiences less stress because slower charging generates less heat, which is better for long-term battery health.

Will my phone charge faster if I turn off low power mode right now?

Yes, noticeably faster — usually 10 to 20 percent faster depending on your phone model. If you need the phone in the next 30 minutes, it's worth turning off. If you're charging overnight, the difference is too small to matter.

Should I always charge with low power mode on?

Only if you're charging overnight or have time to spare. For overnight charging, low power mode is worth using because slower charging is gentler on the battery and you don't need the phone quickly. For daytime charging when you need the phone soon, turn it off.

Does low power mode affect wireless charging differently than wired charging?

Wireless charging is already slower than wired charging, and low power mode slows it down further. The effect is more noticeable because you're starting from a slower baseline. If you use wireless charging, turning off low power mode makes a bigger practical difference than it does with wired charging.

Can I charge faster by using a higher-wattage charger with low power mode on?

A higher-wattage charger will charge faster than a standard charger, but low power mode will still reduce that speed. You'll charge faster than you would with a standard charger and low power mode on, but slower than with a high-wattage charger and low power mode off. The phone's charging circuit is the limiting factor when low power mode is active.