Google has an article on extending battery life with Battery Saver, and a Diagnostics app with a battery section, and those are the two tools for a Chromebook that runs down quickly. Battery Saver lowers display brightness, turns off the keyboard backlight, turns on Chrome Energy Saver, turns on Android Battery Saver when you use apps and throttles the CPU. It turns on by itself at low battery and turns off when you plug in;
a yellow plus symbol on the battery icon shows it is on. Diagnostics, opened from Settings, About ChromeOS, reports the battery's health, cycle count and electrical current, and its discharge test measures the rate of charge and discharge over a fixed period; if the rate is very low, the battery or the charging port may be at fault. A Chromebook Plus 514 has a WUXGA touchscreen and runs ChromeOS, so brightness, video calls and many tabs are the usual draws.
Differential
Likely causes of “Acer Chromebook Plus 514 battery drains too quickly”, and how to tell them apart
- 1
High brightness and backlight
What separates it The battery falls fast at full brightness because of a high brightness and backlight
How to confirm Turn on Battery Saver, which lowers brightness and turns off the keyboard backlight
- 2
Many tabs, extensions and video calls
What separates it The fan and battery both work hard because of many tabs, extensions and video calls
How to confirm Close tabs and extensions you do not need
- 3
An aged battery
What separates it Runtime keeps shrinking and Diagnostics shows a high cycle count or low health
How to confirm Check Diagnostics, Battery; contact Acer for a replacement
- 4
A slow or failing charge
What separates it The discharge test shows a very low rate because of a slow or failing charge
How to confirm Google says the battery or the charging port may be at fault; contact the manufacturer
- 5
A failing cell or swelling
What separates it The Chromebook shuts down with charge showing, or the case bulges
How to confirm Stop using it and contact Acer, since a hot or swollen battery must not be charged
Before you touch a setting
Record this first — changing settings destroys the evidence
- The full model number and ChromeOS version
- Diagnostics, Battery: health, cycle count and the discharge test result
- Whether Battery Saver is on and what brightness is set
- Whether the case, trackpad or palm rest shows any swelling sign
Try in this order
0 of 7 completedOpen Diagnostics
ReversibleOpen Diagnostics, in Settings, About ChromeOS, Diagnostics, Battery, and note the health and the cycle count.
Run the discharge test
ReversibleRun the discharge test, which measures charge and discharge over a fixed period, and then test again to see whether it helped.
Turn on Battery Saver
ReversibleTurn on Battery Saver, in Settings, System preferences, Power, Battery Saver, and watch the battery.
Lower the load
ReversibleLower the load, by lowering brightness and closing tabs and extensions that you do not need.
Update ChromeOS
ReversibleOpen Settings, About ChromeOS and choose Check for updates, then restart when it asks so the update is fully applied.
Charge with the original charger
ReversibleCharge with the original charger, since a weak charger slows charging and can look like fast drain.
Contact Acer if it is aged
ReversibleContact Acer if it is aged, since Google's article points to the manufacturer for battery problems.
Model-specific
What is true of this model and not of its siblings
- A light operating system
- ChromeOS is light and long-lasting on modest hardware per the catalog, so a sharp drop is worth checking in Diagnostics before assuming ordinary use.
- Repair cost
- The battery part for the CB514-4H is Acer KT.00305.014 (AP23A5L, 53 Wh), listed at $99.99 by CDSParts on 2026-09-26. An independent shop charges $129 to $249 to fit a battery, per BadgerLayer, so a checked settings fix is worth trying first.
Stop boundary
When this stops being a self-service repair
- !If Diagnostics shows poor battery health and the Chromebook is in warranty, contact Acer for a replacement
- !If there are swelling signs, stop using it and contact Acer the same day
- !If it shuts down at a moderate charge, update ChromeOS and contact Acer Support
Evidence ledger
Sources behind this answer
The battery listing for the CB514-4H, part number KT.00305.014 (AP23A5L).
What Battery Saver changes, how to turn it on and how to tell it is on.
Battery health, cycle count and the discharge test.
The Chromebook and ChromeOS platform.
Shop price ranges for screen, battery, keyboard and charging-port repairs.
Exact questions
Common questions
Can a video call drain it fast?+
Yes. Calls use the camera, microphone, screen and processor together. Lower brightness and close other tabs during long calls.
Does the keyboard backlight matter?+
Yes. Google lists turning off the keyboard backlight among the things Battery Saver does, so if you type in a lit room, switching the backlight off yourself is a free way to add runtime.
Should I let it discharge fully?+
There is no need. Keep the Chromebook plugged in when you can and let Battery Saver handle low charge; regular deep discharges only age the cell faster.
What does Battery Saver do?+
It lowers display brightness, turns off the keyboard backlight, turns on Chrome Energy Saver and Android Battery Saver and throttles the CPU, per Google's article.
How do I know Battery Saver is on?+
The battery icon in the toolbar has a yellow plus symbol, and in Quick Settings a yellow bubble surrounds the battery icon.
Does Battery Saver work while charging?+
No. Google says it is not available when you plug in, and it turns off automatically when you connect the charger.
What is the discharge test?+
A test in Diagnostics that measures the rate of charge and discharge over a fixed period. A very low rate points at the battery or the charging port.
Does a touchscreen use more battery?+
The display is the biggest draw on any laptop. Lower brightness first.