# What is the voltage of a laptop battery?

My stock battery was a 6-cell 4000mah 11.1v and the new battery is an 8-cell 4800mah 14.8v . I know that 8-cell and 4800mah is okay, but what about the 14.8v instead of 11.1v? The battery description says it’s compatible with my laptop model (AS5100, model BL51), but the voltage difference makes me wonder.

Subsequently, one may also ask, how much current is required to charge a laptop?

Most likely, all you will need is 5 amps. Look at your laptop power adapter (the black brick). On the backside it should tell you what the power draw is in amps. Most likely its 1 to 2 amps.

How much current does a laptop use?

This is on the low end of power consumption for a laptop. Over an hour of usage it uses 12 Wh of electricity, which is 83 hours of use per kWh. With an average cost of electricity of 12c/kWh, this means that for \$1 in electricity I can run my laptop for 651 hours.

How much mAh does a laptop use?

As long as the voltage is close it should work. Most laptop battery makers advertise their batteries power capacity in terms of 4400, 5200, 5600 or 5800 mAh. The basic idea is that 5800 mAh battery pack will allow your laptop to run longer than a battery with a 4400 mAh rating.

## What voltage does a laptop use?

The 19 volts is to charge the battery pack which has multiple Li-ion cells in series. The laptop internal electronics are powered by a switching regulator from the battery voltage and/or the 19 volts from the AC adapter. This gives a decent run-time for the laptop as the battery voltage drops from discharge during use.

## How long does a 4 cell battery last on a laptop?

Depending on the brand and make of the battery, a 4-cell can last from 1.5 to even 3 hours, but that will vary due to specific details like screen brightness, battery power settings (running on low-usage or maximum-efficiency), playing games or watching DVDs/Blu-ray.

## How do you calculate battery watt hours?

Convert mAh to Watt hours. Insert milliamp hour (mAh) and voltage (V) and click on Calculate to obtain Watt hours (Wh). Formula is (mAh)*(V)/1000 = (Wh). For example, if you have a 300mAh battery rated at 5V, the power is 300mAh * 5V / 1000 = 1.5Wh.

## How can I check my laptop battery health?

Windows 7: How to check your laptop battery health in Windows 7

• Click Start button and type cmd in Search programs and files box.
• Right click on cmd.exe listed at the top of the Start menu and click Run as administrator.
• In the command prompt type cd %userprofile%/Desktop and press Enter.
• Next type powercfg -energy in the command prompt and press Enter.
• ## How many amps does it take to run a laptop?

Most likely, all you will need is 5 amps. Look at your laptop power adapter (the black brick). On the backside it should tell you what the power draw is in amps. Most likely its 1 to 2 amps.

## How many volts is a 12 volt battery fully charged?

For instance, a 6 volt battery will have 3 cells (3 x2.2= 6.6 volts), a 12 volt battery will have 6 cells (6 x2.2=13.2 volts) and so on.That 2.2 volts is the fully charged, straight off the charger number.

## How many volts are in a battery?

AAA, AA, C, D batteries all are rated at 1.5 volts but besides the difference in physical size there is a big difference between them all. In an electrical circuit or device, there are two really important things:voltageandcurrent.

## What is the voltage of a laptop charger?

For mobile phones and other mobile devices like the Kindle that charge with USB, the voltage is typically 5V. A laptop charger might be as high as 20V or 25V. You can usually find the voltage your device needs on the device itself, on the battery, or if all else fails, on the manufacturer’s web site.

## Can you charge a battery with a higher voltage?

In practice that means a few volts higher than the battery normal output voltage. Thus for a 12V car battery the charger must put at least 14 volts or thereabouts across the battery. Added: you can use a 100V source to charge a lower voltage battery. You do it by what’s called ‘trickle’ charging.

## What is the voltage on a 12 volt battery?

Fully charged automotive batteries should measure at 12.6 volts or above. When the engine is running, this measurement should be 13.7 to 14.7 volts. If you don’t have a multimeter to tell you the voltage of your battery, you can do a test of your electrical system by starting the car and turning on the headlights.

## What is the capacity of a laptop battery?

As long as the voltage is close it should work. Most laptop battery makers advertise their batteries power capacity in terms of 4400, 5200, 5600 or 5800 mAh. The basic idea is that 5800 mAh battery pack will allow your laptop to run longer than a battery with a 4400 mAh rating.

## What is the cut off voltage?

In electronics, the cut-off voltage is the voltage at which a battery is considered fully discharged, beyond which further discharge could cause harm. Some electronic devices, such as cell phones, will automatically shut down when the cut-off voltage has been reached.

## Can you charge a 3.7 V battery with a 4.2 V charger?

1 – Yes, your understanding is correct. 2 – The minimum voltage required to charge a 3.7v Li-Ion battery (to 3.7v), is 3.7v. A more practical voltage would be, 4.0v (3.7 < 4.0 < 4.2). But considering impedances of the charger and cell, most chargers have 4.25 or even 4.3V when running blank (not connected to a cell).

## What type of battery is used in a laptop?

Three types of batteries power the laptops you’ll find in service today, nickel cadmium (NiCad), nickel metal hydride (NiMH), and lithium ion (Li-ion), with Li-ion being the most common in newer laptops. Each battery type has a different chemistry for generating a charge and, therefore, different characteristics.

## What is the voltage of a AAA battery?

Nominal VoltageChemistryBattery SizeNominal VoltageAlkaline or Zinc-carbonAA, AAA, C, and D1.5VAlkaline or Zinc-carbon9V9VLi-MnO2Coin Cell3VLi-ion, Li-polyVarious sizes3.7V

## How many volts is a computer charger?

You could use a Lightning connector plugged into a computer (via USB), an iPhone charger connected to a wall socket, or an iPad charger connected to a wall socket. A PC USB charger delivers 2.5 Watts of power (5 volts at 500 mA). An iPhone charger delivers 5 Watts (5 volts at 1000 mA).

## How long does a 3 cell battery last on a laptop?

Many netbook manufacturers, including Dell, HP, and Lenovo, seem reluctant to ship devices with extended batteries, saddling users with 3-cell systems that last just over two hours. Currently, Dell only offers its Mini 9 and 10 with a 4-cell battery.

## Can you overcharge a lithium ion battery?

The control system prevents overcharging, which can cause the lithium ion battery to overheat and potentially burn. This is why the Li-ion batteries are more expensive. The only way for the Li-ion battery to overcharge is if the charging system malfunctions, and then the battery will heat up while in the charger.

## What does the voltage tell you?

Voltage is a measure of the difference in electrical energy between two parts of a circuit. The bigger the difference in energy, the bigger the voltage. Voltage is measured in volts. The symbol for volts is V. For example, 230V is a bigger voltage than 12V.

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