How many spare POC batteries can I bring on a plane?

For batteries under 100 Wh (which covers most Inogen and OxyGo single and double batteries), the FAA sets no numerical limit—but you must be able to physically carry them. Use the 150% rule based on your total transit time to determine the exact number you need.

Can POC batteries go in checked luggage?

No. All spare lithium-ion batteries must be in your carry-on baggage. Only the battery currently installed in the device may be in checked luggage (inside the device). This rule is non-negotiable under FAA Advisory Circular AC 120-76E.

Does heat make a laptop battery drain faster?

Heat doesn't drain a charge faster by itself, but it permanently degrades lithium-ion cells, so a laptop run hot — on soft surfaces that block vents, or with a clogged fan — loses capacity sooner. Reducing heat extends battery life but can't reverse wear that has already happened.

When should I replace my laptop battery instead of tweaking settings?

If you've tuned your settings and the laptop still dies quickly, or a battery health check shows full-charge capacity well below the original, the battery has reached the end of its useful life and replacing it will restore most of your runtime. Any swelling means stop using it and replace it as a safety issue.

Why Your Laptop Battery Drains Fast (and How to Fix It)

June 26, 2026 Cao Chuanping

A laptop that used to last all day but now needs a charger by lunchtime is one of the most common — and most fixable — frustrations. The key question is whether you're fighting a settings problem you can solve in minutes, or a worn-out battery that needs replacing. Here's how to tell which, fix the easy stuff, and know when it's time for a new pack.

First: is it settings or a worn battery?

Fast battery drain has two broad causes, and they have very different fixes:

Software & settings

Apps, brightness, and power options burning through charge. Fixable yourself in minutes, free.

A worn-out battery

The cells can no longer hold their original charge. No setting fixes this — it needs a new pack.

A quick way to tell them apart is a battery health check. On Windows, run powercfg /batteryreport in Command Prompt and open the HTML; on Mac, hold Option and click the battery icon, then Battery Health. If full-charge capacity is far below the original design capacity, the battery itself is worn — skip ahead to replacement.

Common software and settings causes

If the battery is healthy but still drains quickly, these are the usual culprits — and the fixes:

The frequent settings/software drains and how to fix each.
Cause	Fix
Background apps & browser tabs using CPU when idle	Close them; check Task Manager (Windows) or Activity Monitor (Mac) for heavy processes
Screen brightness high; display sleeps late or never	Lower brightness; set a short display-sleep timeout
Power mode set to maximum performance	Switch to a balanced or battery-saver profile
Wi-Fi, Bluetooth, keyboard backlight left on	Turn off what you're not using
Pending updates or a stuck process keeping the system awake	Install updates; restart to clear a misbehaving process

Work through these first. For many people, a couple of these changes restore a big chunk of runtime — no new battery needed.

How heat and age affect battery life

Two things wear a battery down over time, and they're worth understanding because one is partly in your control:

Heat. Lithium-ion batteries degrade faster when run hot. A laptop used on soft surfaces that block its vents (a bed or couch), or with a dust-clogged fan, loses capacity sooner. Keeping it cool and ventilated slows this down.
Age and cycles. Every battery has a finite number of charge cycles — typically 300–500 — after which it simply holds less charge no matter how carefully you use it.

Reducing heat extends a battery's remaining life, but it can't reverse wear that has already happened. Once the cells have degraded, only a replacement restores the lost capacity.

When to replace the battery

It's time for a new pack when:

You've tuned your settings and the laptop still dies quickly
A battery health check shows full-charge capacity well below the original (roughly under 60–70% of design)
The laptop shuts down suddenly even when it shows charge remaining

In these cases the battery has reached the end of its useful life, and replacing it will restore most of your runtime — typically for $40–150, versus hundreds for a new laptop.

If you notice any swelling — a raised trackpad, a bulging case, or a laptop that won't sit flat — stop using the battery and treat it as a safety issue. See our guide on swollen laptop batteries for how to handle it safely.

Find a replacement that fits

To replace a worn battery, match your laptop's part number using our guide to finding the right battery, then jump to your brand:

DellLatitude, Inspiron, XPS, Alienware HPPavilion, EliteBook, Envy, ProBook LenovoThinkPad, IdeaPad, Legion

Or browse the laptop battery collection and check the part number against your label before ordering. For the whole process end to end, see our complete guide to laptop battery replacement.

Tuned everything and it still won't hold a charge? Send us your laptop model and the part number on your battery label via WhatsApp and we'll confirm the exact match — or start from the laptop battery collection. Grade A cells, a proper BMS, certified and warrantied.

Frequently asked questions

Why is my laptop battery draining so fast?

Either power-hungry software/settings (background apps, high brightness, performance mode, Wi-Fi/Bluetooth/backlight on) or a worn battery that can't hold its original charge. A battery health check tells them apart.

How do I check if the battery is worn out?

Windows: run powercfg /batteryreport and compare full charge vs design capacity. Mac: Option-click the battery icon, then Battery Health. Well below design (~under 60–70%) means worn.

Does heat make the battery drain faster?

Heat doesn't drain charge faster by itself, but it permanently degrades the cells, so a hot-running laptop loses capacity sooner. Reducing heat extends life but can't reverse existing wear.

When should I replace instead of tweaking settings?

If tuned settings don't help, or a health check shows capacity well below design, the battery is done — replacing restores most runtime. Any swelling means stop and replace it as a safety issue.

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