Battery advice collects a lot of folklore. These twelve settings, drawn from guidance published by Asus, are the ones that do measurable work.
The display is the biggest single draw
- Lower the refresh rate from 120 Hz to 60 Hz. On a laptop with a high-refresh screen this is usually the largest single saving available, and for reading and office work the difference is barely noticeable.
- Reduce brightness to the level you actually need rather than the level it shipped at.
- Use dark mode. This matters most on OLED displays, where dark pixels are genuinely switched off rather than dimmed. On an ordinary LCD the saving is small, because the backlight stays on regardless.
Windows settings
- Energy Saver mode in Windows 11 slows battery drain. It turns on automatically at 30% charge, and you can switch it on manually at any time — there is no reason to wait for 30%.
- Choose "Best power efficiency" in the power settings.
What is running, and what is plugged in
- Close background apps that use memory or drain power when you are not using them.
- Turn off Wi-Fi and Bluetooth when you do not need them; airplane mode does both at once.
- Disconnect unused peripherals — pen drives, external hard drives, mice. An external drive in particular draws its power from the laptop.
On gaming and heavy-workload laptops
- Use the integrated GPU rather than the dedicated one when you are not gaming. On a machine with a discrete graphics card this is a large saving and costs nothing for ordinary work.
- Control CPU core usage through the manufacturer's own app.
The one that matters most
Enable battery care mode in the vendor's app, which limits charging to 80%. Keeping a laptop plugged in at 100% all the time damages the battery.
This is the setting worth changing today, and it is especially relevant in Bangladesh. A lithium-ion cell ages fastest when it is held at a high state of charge, and a laptop that lives on the charger at a desk sits at 100% for most of its life.
There is a real trade-off: during load-shedding, a machine capped at 80% gives you less runtime when the power goes. If your laptop is your UPS, the cap costs you something real. If it rarely leaves the desk, the cap is close to free and will add years to the battery.
If it still drains quickly
Run a battery health check — most manufacturers include a diagnosis tool — to see the battery's actual condition. A cell that has lost a large share of its original capacity will not be rescued by settings, and knowing that saves you from chasing the problem through software.
Heat is the variable nobody lists
One factor sits behind all of these and rarely appears in the settings list: temperature. Lithium-ion cells degrade faster when warm, and a laptop on a bed, a sofa or a lap is a laptop with its vents blocked. In a Dhaka summer, in a room without air conditioning, a machine under load runs hot regardless of its settings. Raising it off the surface so air can reach the underside does more for long-term battery health than several of the software tweaks above, and costs nothing.
