ZTHY B21N1818-3 C21N1818-3 Battery Compatible with Asus VivoBook 14 D409 M409 F409 A409 X409 X415 D415 M415 F415 15 D509 A515 F515 M515 R565 S515 X515 A515JA F515MA M515UA S515EA X515D R565E R565F

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3) 30-days after purchase, we offer a no-questions-asked return policy.
4)12 months from the date of purchase, If the product fails, we will replace it with a new one.
1) You need to turn off your laptop and disconnect the power.
2) Disconnect the connection between the old battery and the motherboard to avoid unnecessary damage caused by disassembling the battery. Then unscrew the old battery screws one by one and carefully save each screw.
3) Remove the old battery, carefully install the new battery on the battery case, screw in the screw, and connect the wiring of the new battery.
4) If you don't understand the above steps, you can search for the video about laptop battery installation on YouTube. Maybe it will help you.
1)Discharge the new battery use to 10%(not to 0%) and then charge to 95%, and cycle 3-4 times.
2) Do not disassemble, crush or puncture. Do not dispose of in fire or water.
3) If you remove the battery for a long time, charge more than 80% at least one time within one month.
4) Don't connect the adapter for a long time while using the battery. It may damage the battery.
5)When using the battery, care should be taken to prevent exposure and moisture.
1) Could be caused by battery loss. Please re-install the battery and make sure that the battery cable and the motherboard interface are tightly inserted.
2) Maybe due to conductive material damage which the laptop motherboard and battery anode and cathode contact position, you can try to confirm it with your original battery.
3) Check whether the battery drive is in normal condition, if not, download the corresponding driver software to update.
1.Turn off the laptop.
2.Unplug AC power.
3.Remove the battery.
4.Replace AC power.
5.Turn on laptop,allow OS to boot.
6.Once logged in to the machine,perform a normal shut donw.
7.Unplug AC power.
8.Replace battery.
1, Change your laptop power plan settings, and choose the power saver plan. Then Change advanced power settings, and scroll down to find Processor power management. Click the On-battery option and reduce the processor state to 20%.
2, Always keep your laptop neat and clean. The dust easily enters the hardware through the vents which are meant to release the heat generated from various computer components.
3, Close Wi-Fi, Bluetooth, and other settings. This can help your computer save precious battery life.
Compatible Part NumberB21N1818-3 C21N1818-3Compatible ModelReplacement for Asus VivoBook 14 D409 D409B D409BA D409D D409DA D409DJ D409DL Series;Compatible ModelReplacement for Asus VivoBook 14 M409 M409B M409BA M409D M409DA M409DJ Series;Compatible ModelReplacement for Asus VivoBook 14 F409 F409DA F409J F409JA F409JB F409F F409FA F409FB F409FJ F409U F409UA F409UB Series;Compatible ModelReplacement for Asus VivoBook 14 A409 A409DA A409M A409MA A409F A409FA A409FB A409FJ A409J A409JA A409JB A409JP Series;Compatible ModelReplacement for Asus VivoBook 14 X409 X409DA X409BA X409F X409FA X409FB X409FL X409FJ X409J X409JA X409JB X409JP X409M X409MA Series;Compatible ModelReplacement for Asus VivoBook 15 D509 D509B D509BA D509D D509DA D509DJ D509DL Series;Compatible ModelReplacement for Asus VivoBook 15 M509 M509B M509BA M509D M509DA M509DJ Series;Compatible ModelReplacement for Asus VivoBook 15 F509 F509DA F509J F509JA F509JB F509F F509FA F509FB F509FJ F509U F509UA F509UB Series;Compatible ModelReplacement for Asus VivoBook 15 A509 A509DA A509M A509MA A509F A509FA A509FB A509FJ A509J A509JA A509JB A509JP Series;Compatible ModelReplacement for Asus VivoBook 15 X509 X509DA X509BA X509F X509FA X509FB X509FJ X509FL X509J X509JA X509JB X509JP X509M X509MA Series;Compatible ModelReplacement for Asus VivoBook 14 X415 X415D X415DA X415DAP X415E X415EA