234219-B21 Battery, COMPAQ 234219-B21 Laptop Battery

How can i sure this 234219-B21 battery is the correct one i need?

• My original COMPAQ 234219-B21 battery is most the same as the picture in this page.
• The same out put volt as my original battery.
• It can compatible the battery model of my COMPAQ 234219-B21 original battery.
• It is show clearly this battery can fit my machine model.(Not Necessary).

Other usefull knowledge for find a correct laptop battery.

• Battery OutPut Volt : 10.8v and 11.1v, 14.4v and 14.8v can compatible each other, beacuse all laptops can deal with as max as 0.8V voltage difference.
• Higher capacity means longer working time and use life, it is a good choosen.
• Try seach with the laptop model or battery number on our site, you can find correct item easliy.
• Tell us your laptop model and the battery number will help you get a correct item.

What can we do to extend a laptops battery life?

• While using your laptop, whenever possible, try to use the electricity line as power source.
• Always try to keep to laptop battery on full charge.
• Try to avoid playing games on laptop using battery power.
• High temperature is harmful to the battery, it is a good idea to add a usb cooler for your laptop.
• There are some very beautiful animated themes for Windows OS. Though being beautiful, using these is one of the main reasons of battery being out of order sooner than expected.
• When you use your battery to run laptop, try to follow the following suggestions:
• Don’t use unnecessary software. Only use the ones with necessity.
• Reduce monitor brightness as much as possible.
• Don’t use unnecessary USB peripherals, such as speaker, keyboard, portable hard drive etc.
• If unnecessary, don’t use Bluetooth or WiFi.
• Use Windows Recommended Power Plan. To do so, go to Start>Control Panel>Power Option>(choose) Balanced (Recommended).

How often should I completely discharge my laptop battery?

Intentionally... never. Unless your battery management controllers are needing to be calibrated to the actual battery capacity there is no need to deplete the battery. Lithium ion batteries are happiest between 60% and 80%, fully charged or discharged batteries have high and low voltage stresses respectively. Fortunately it is supposed to be impossible to fully discharge a lithium ion battery, the battery management circuits typically cut you off to keep them above 3 volts per cell which is the danger zone. This is why a phone with a depleted battery can still power up and show a low battery icon, it's a safety net to avoid anyone blowing up their batteries, you get to see the 0% to 100% of the usable charge range of the batteries.

Coincidentally, ideal usage of lithium ion batteries isn't that different from normal laptop and phone usage, like I said the more time it spends in the 60% to 80% range the better as that's near the ideal charge voltage of this battery type and unless the user is like me they usually don't spend a ton of time fully charged unless they plug in over night.