This battery is not compatible with the battery voltage(rating) 14.4V and 14.8V. 
This battery is not compatible with the battery voltage(rating) 10.8V and 11.1V. Our new Acer Aspire 9811WKMI replacement battery is made of the best battery cells and components. The batteries for Acer Aspire 9811WKMI supplied on the site nzbattery.co.nz are all passed the tests of UN38.3 and RCM, CE, UL, ROHS, ISO9001/ISO9002 and other international identification. To maximize decrease the risk of potential safety hazards, ensure the good experience of the users, our Acer Aspire 9811WKMI notebook batteries were incorporated protection measures as well. E.g, protection of temperature, circuit, Rests, over-voltage, hardware, output current limiting threshold, input and overcharge.
Ingenious and precision work, advanced equipment, and professional technician team are the guarantees of the new vitality of Acer laptop and excellent-experience of buyers. We are factory outlets, not distributors. This is why our replacement Acer Aspire 9811WKMI battery's price is usually much cheaper than other competitors. Please inform our customer service team if you find out there is cheaper than ours, we will help you out.
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Not all compatible models are listed. If you can't find your laptop model here, feel free to contact our customer service to inquire about the compatibility.
The life of the battery is usually calculated by the times of full-charge and discharge. The lithium battery is 400 to 500 times. You do not worry about the increase of the cycle count when you charge the power available battery, because it will only be increased by one time when your Acer Aspire 9811WKMI laptop battery is getting fully charged and discharged.
Our Acer Aspire 9811WKMI replacement laptop batteries are all new. The old or refurbished battery will not be allowed to sell to consumers. Your safety can be guaranteed by the best battery cells and elements we employed.
We do not recommend removing the battery to prevent the ongoing computer data from being lost due to a sudden interruption of the AC power. If removed, we recommend wrapping the battery for Acer Aspire 9811WKMI in plastic wrap and placing it in a cool, dry place. Remember to at least once charging a month to avoid loss of battery activity.
There are few differences except that our battery has no brand label. All rechargeable batteries available at Nzbattery.co.nz are original manufacturers' backup batteries. They use the same smart chips and cells as original's, so the performance and compatibility of Acer Aspire 9811WKMI battery are similar or even better than the original rechargeable battery. This will deduct the brand premium while maintaining quality. Many consumers think that the performance of the original battery is better. In fact, many branded laptop batteries are also manufactured by components from third parties (such as Samsung, LG, etc.). Just as the laptop CPU is not developed by a brand computer company itself.
We offer a one-year warranty on all laptop batteries. If the purchaser has properly installed the battery on the device and used the battery, the warranty applies.
We will check the performance of each product before shipment. If you are not satisfied with our Acer laptop battery, you can enjoy a 30-day money-back guarantee.
If you have any problems with the battery you purchased from us, please contact us first. We will proceed your request and seek a solution. If it needs to return, we will generate an RMA number (Return Merchandise Authorization) for you. Once the test result indicates that the returned battery is defective, we will bear the cost of shipping the battery. (If you return without an RMA number, we won't process the returned battery.)
