42T4979 Battery for IBM THINKPAD S420 E420S Series – 49wh

Q:What is the best way to keep your laptop battery healthy?
A: Keep it in a cool place-Do not let the battery in a high temperature (over 35 degrees Celsius). Ideal in under 25 degrees Celsius.
Unplug when it is fully charged-Do not plug when it is charged fully (do not charge over night).
Plug when it is in low level-Should plug when the battery level is under 15%.
Q:Is it necessary to "calibrate" modern lithium ion laptop batteries?
A:Battery calibration doesn’t extend its life, rather its purpose is to calibrate its state of charge against the laptop 's "fuel gauge" so the laptop knows when to charge, stop charging, or shut down the laptop when battery charge is depleted - the reason calibration becomes necessary is because the battery’s discharge curve changes as it ages.
It won’t hurt anything to go through the calibration cycle, and doing it will give you the confidence that the fuel gauge will accurately reflect the battery’s state of charge, at least for a couple of years depending on how you use your laptop.
Q:What's the difference between a 4400 mAh and a 4800 mAh laptop battery?
A:One battery has 400 mAh more, and this affects both how long it will last and the amp output.
Amp output assuming it is a 1C battery then:
4400/1000 = Ah 4.4 (this is to convert mAh to Ah)
4800/1000 = 4.8 Ah
and C*Ah= Amp Output so the numbers remain unchanged and the bigger battery will output 400 mA (.4A) more current
as for how much longer the other will last:
4.4 Ah at 4 amp draw the bigger battery would (theoretically, but voltage drop between the two batteries may make this false) last 6 minutes longer.
Q: Does overcharging damage the battery for IBM 42T4979?
A: Overcharging can create excessive heat which bends the plate within the cells and shed active material then results in the capacity loss.
Q: What should I do if the IBM 42T4979 battery replacement gets hot in my laptop ?
A: It is normal that the battery becomes warm. When it becomes too hot, take the battery out and let it cool down. If the problem persists once it is inserted back into the laptop, the battery could be defective and need to be replaced.

Discover Why charger-batteries 's IBM 42T4979 Batteries Will Keep Your laptop Working for Years

Is your laptop's life span just not what it used to be? laptop batteries are like other batteries - eventually and inevitably, they get used up. The average battery gets up to 500 charges or life cycles. Now, what you should do is invest in a high quality battery. You'll want to avoid cheap low quality replacement ones as they don't last and can potentially cause a fire.

charger-batteries's premium IBM 42T4979 batteries, for example, are some of the very best and provide long run-times. They contain the same reliable components as the original IBM THINKPAD S420 E420S Series batteries, often outperforming the original battery itself.

Fits Into Your laptop With Absolute Ease

High Performance IBM THINKPAD S420 E420S Series batteries are designed to complement the fit and finish of your IBM laptop. This battery is manufactured using the highest quality battery cells with integrated charge indicator LEDs. Depending on the capacity you've selected some upgrades last up to 68% longer than the factory issued laptop battery. This battery will perform better and fit more snugly than anything else on the market.

Improves Battery Level Giving You Long-Term Power

Our battery is built for longevity. It's environmentally responsible and feature RoHS certification to be free of anything harmful including lead, mercury, cadmium, PBBs, and PBDE. We try to provide 100% customer satisfaction. That's why we offer a 30 day money back guarantee, no-questions-asked policy and 1 year warranty service. We remove all risk to ultimately make our customers happy with their purchase.

Quickly Makes Your laptop Feel Like New

When looking for a high performance longer lasting battery, you'll find High Performance IBM  42T4979 batteries were created to exceed expectations. What does this mean? It means you can now listen to more music, watch your favorite movies or tv shows, and get a lot of work done - all without having to worry about your laptop slowing down. And, to ensure your confidence, and satisfaction, these high quality batteries are backed by our hassle-free warranty and awesome 7 days a week live customer support.

The average battery life doesn't last that long for most people. In fact, if your battery is only lasting less than half an hour, it's time to replace your battery. A fast depleting battery could very swiftly stop you in your track. Leaving you without any mobile power. That's why you should maximize your performance and consider getting the High Performance IBM 42T4979 ones as soon as possible. Use it to keep your laptop battery working for many hours between charges. Please be sure to get the right battery for your IBM THINKPAD S420 E420S Series laptop!

FREE REPLACEMENT

During the warranty period, if the 42T4979 battery replacement is completely dead, we will replace the battery for you.

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