Laptop Batteries FAQs
What do the power ratings mAh, Volts, Whr and Watts mean?
Milliamp Hours or mAh represents the amount of stored energy in your battery. The higher the mAh rating the longer a battery will last. Many of our batteries have higher mAh ratings than original brand batteries. These higher mAh batteries are still 100% compatible with your laptop. It just means the higher capacity battery will last longer than the original.
Watts measures the amount of energy a device uses. This rating is commonly found on your monitor, laptop or other devices that pulls energy from a battery source. Watt Hour or Whr is the amount of power used over a period of time (1 hour). 1 Whr is equal to 1 Watt of power used for an hour.
Voltage measures the volume of electricity that is delivered to your laptop. Many laptop makers have produced batteries that have differing voltage ratings. There are no compatibility issues if your laptop and laptop battery have different voltage ratings. We carry both 11 volt and 14 volt versions of the same battery in case you are unsure.
Most laptop chargers are rated at 19 volts. The extra voltage a charger has over a battery is so the charger can simultaneously power the laptop and charge the battery (if they had the same voltage rating the charger would only have enough power to run the laptop).
Cells Voltage / Cell Formula Nominal Voltage
1 cell 3.6V or 3.7V 1 cell x 3.6 or 3.7V 3.6V or 3.7V
2 cells 3.6V or 3.7V 2 cells x 3.6V or 3.7V 7.2V or 7.4V
3 cells 3.6V or 3.7V 3 cells x 3.6V or 3.7V 10.8V or 11.1V
4 cells 3.6V or 3.7V 4 cells x 3.6V or 3.7V 14.4V or 14.8
Can You Revive a Dead Laptop Battery?
The simple answer is no. Just like a car battery, your laptop battery is a component that is guaranteed to wear out over time. If your laptop battery is not working after charging or is more than 2 years old it may have already experienced its life of 300-500 recharges.
Do not try to disassemble the laptop battery or try the DIY methods listed out there. If your laptop battery is less than 2 years old but doesn't hold a charge as long as it used to, you can calibrate your laptop battery to regain the full power capacity.
If your laptop does not power on even while plugged into the wall charger, you may need to replace your AC Adapter. There may also be other issues with your laptop, such as a faulty power connector or fried motherboard.
Should I buy a used Laptop Battery?
We at The Brand Store do not recommend or sell used laptop batteries. Buying a used laptop battery is like buying a used car battery and won't improve battery time much more than your current one. The life of a rechargeable laptop battery is about 300 to 500 charge and recharge cycles, or about 3 years. A used laptop battery may not be any better than the non-functioning one you are currently seeking to replace. And compared to the cost of a brand new replacement laptop battery they are not a bargain.
How can I extend my laptop battery run time?
Your new laptop battery will have an average run time of 1 1/2 hours to 3 1/2 hours depending on what applications you are running. Functions that require more power will deplete your battery faster. You can extend your battery run time by minimizing the main power draws on your battery - the LCD brightness levels and the use of your CD or DVD drive. Also, some notebooks simply use more power than others.
You can prolong your laptop battery life by adjusting the power management selections within your operating system software. If you are a Windows user, you can go to the control Panel and select power options. In this area you can choose when and how you can maximize your laptop battery settings.
How can I minimize the power my laptop uses?
Your laptop battery life depends on the power capacity of your laptop battery and the amount of energy your computer draws. You can maximize your laptop battery life by changing the amount of power your computer draws while in battery mode.
Tips to Reduce Power Usage and Maximize Laptop Battery Run Time:
-Reduce the brightness of your laptop screen. The screen is the biggest battery drain.
-Avoid using the CD or DVD drive as the motor consumes a fair amount of power.
-Turn off your wifi finder if you're not connected to the internet.
-Remove any devices plugged into your USB ports or other ports.
-Close unused programs or apps
If you are a Windows OS user, within the Control Panel section you will find Power Options. In this section you can change power use and low power alerts. Windows users will also be able to lower the brightness of the LCD panel and extend the battery life considerably. You can also extend your battery life between charges by minimizing the use of your CD and DVD drive operation.
If you are a Mac OS user, within the System Preferences go to the Energy Saver to access the battery and power adapter settings. You will be able to adjust graphics, screen, disk and sleep settings that improve battery usage and laptop performance.
How to Calculate Laptop Battery Run Time
You can calculate your laptop battery life by dividing the battery capacity (Watt-hours or Whr) from the power consumption of your laptop (watts).
Calculate Battery Life
Watt Hours / Watts = Battery Life (in hours)
Example: 60 Whr / 20 Watts = 3 Hours
Laptop Battery Life Calculator
Enter the Watt Hours and Watts to calculate your battery life in hours. If you don't know the Watts or Watt-Hours, use the formulas below.
Whr= Volts x mAh / 1000
Example: 14.8 Volts x 4060mAh / 1000 = 60.09 Watt-Hours (rounded up)
Calculate Milli-Amp Hours
mAh = Whr x 1000 / Volts
Example: 60.09 x 1000 / 14.8 = 4060 mAH (rounded down)
How to Extend the Life of your Laptop Battery
Using the CD/DVD player, streaming media and the screen brightness use up the most battery. Dimming your screen even a lit bit can give you noticeably more battery life. Most laptops have a power management control panel where power use can be reduced while on battery power, such as reducing the brightness of your LCD screen.