ZTHY B21N1818-2 C21N1818-2 Battery Replacement for Asus VivoBook 14 F412DA F412DK F412FJ F412FL A412FA A412DA A412FL A412FJ R424DA R424FA X412DA X412FA X412UA X412UB S14 S412FA S412FJ S412FL S412DA

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1: High capacity circulatory function
2: Low power consumption IC design
Battery Type: Li-polymer
Voltage: 7.7V
Capacity: 37Wh/4850mAh
Condition: 100% New from Manufacturer, Grade A Cell
Replace Part Number:
C21N1818-2 B21N1818-2
Need Attention: There are two battery C21N1818-1 and C21N1818-2, they are not compatible with each other. Please choose which one you are going to replace and according to your laptop's original battery.
Compatible with: (use "ctrl+F" to find out your model quickly)
Replacement for Asus Y4200 Y5200F Series;
Replacement for Asus VivoBook S14 S412F S412FA S412FJ S412FL S412D S412DA S412DK S412U S412UA Series;
Replacement for Asus VivoBook 14 A412 A412D A412DA A412DK A412F A412FA A412FL A412FJ A412U A412UA Series;
Replacement for Asus VivoBook 14 F412 F412D F412DA F412DK F412F F412FA F412FL F412FJ F412U F412UA Series;
Replacement for Asus VivoBook 14 R424D R424DA R424F R424FA Series;
Replacement for Asus VivoBook 14 X412 X412D X412DA X412DK X412F X412FA X412FJ X412FL X412UA X412U X412UB X412UF X412J X412JA Series.
1. First check if the battery is the same size as your original battery after receiving it. When installing the battery, pay attention to whether the battery cable is fixed. If the battery cable is not installed correctly, the battery may not be charged.
2. If you use the battery for the first time after installing the battery, please do not charge the battery immediately, first use the battery to 10-20%, and then charge the battery, and cycle charging 5-6 times to activate the maximum use of the battery space.
3. We recommend that you search for battery removal tutorials on the Internet in advance, or seek help from a professional technician. We won't responsible for any damage due to improper operation.
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.
Q: Why my computer didn't recognize this battery or I install this battery and it doesn't seem to work?
A: The reason is residual power stored in the laptop components that was preventing the battery from working properly. Please disconnecting the old battery, and holding down the power button for 20 seconds, then connect the new battery. This drains the residual or flea power and once the laptop is reassembled the battery will function properly.
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.
Why should I choose this battery? Specifications: ZTHY laptop battery instruction: Easy to deal a variety of use environment Install A New Battery: Installing New Battery Frequently Asked Question Solution: The following are troubleshooting methods: