Note : 1. 10.8V and 11.1V are compatible, they are in common use.

Employed high quality cells from Samsung, the brand new 10.8V 8800mAh(12 cells) replacement Compaq Presario R4000CA Series Li-ion battery is totally compatible with the original manufacturer's specifications. Through tested, all our Li-ion replacement batteries for Compaq Presario R4000CA Series have been certified to meet and even exceed the original battery performance. Each replacement battery of the Compaq Presario R4000CA Series laptop has been tested on the Compaq system before being dispatched to ensure the safety of your Compaq laptop.

Except for being designed under the supreme control criterion, the high-quality replacement Compaq Presario R4000CA Series laptop battery carries with a smart interior circuit board that provides battery-unbalanced-shut-off protection, thermal-runaway protection, overcharged protection, over-discharged-shut-off protection, and high/low-temperature-shut-off protection. Besides, the battery contains free lead, mercury and other environmental metal pollutants. It is compliance with international standards. Every replacement Compaq laptop battery has passed through a series of rigorous safety tests and been certified by CE, UL, ROHS, ISO9001/9002. Generally speaking, this replacement Compaq Presario R4000CA Series battery can be charged/discharged up to more than 600-800 cycles.

Thank you for purchasing this high quality replacement Compaq Presario R4000CA Series laptop battery at hplaptopbattery.com.sg. Our batteries are packed in carton boxes with anti-static bags and anti-pressure sponge, in order to effectively protect the battery in shipping. We have a rigorous testing process to ensure that your orders (e.g. this battery for Compaq Presario R4000CA Series laptop) are perfectly functional before packaging and sending it to you. Before placing an order, please make sure that the part number of your old original Compaq Presario R4000CA Series battery is listed as below and has the same shape as our battery image (please view the larger images for details).

Product Larger Images

Compatible Compaq Battery Part Number

Compatible Compaq Laptop Model Name

Shipping Methods

Payment Methods

We Accept Payment Methods
PayPal	Payments by PayPal, NO PayPal Account required.
PayNow	You can use the above Bank App to scan the QR Code for payment.
GrabPay	You will be redirected to Grab website, log into your account for payment.

Warranty

1-Year Warranty
All our high quality replacement batteries for Compaq Presario R4000CA Series notebook come with a 1-year warranty. Warranty is applicable if the buyer has installed the battery properly in the device and has treated the battery correctly.

30-Day Money Back Guarantee
Our goal is to turn customer satisfaction into ‘Complete Customer Satisfaction’. That's why we offer you a 30-day money back guarantee, on top of our warranty and RMA procedure for defects!
Please note: in order to qualify to get your money back, you must first contact us and await instructions before sending back your product.

Returns

If you have a problem with one battery which bought from us, please contact us first. We will process your request and try to find a solution for your problem. If the problem cannot be fixed by our technical support engineer, we will generate an RMA number (Return Material Authorization) for you. If inspection concludes that the returned battery is defective, a new battery will be shipped out without extra charge.
Please note: we cannot process returned batteries if you have not yet received an RMA number.

FAQs

Q: How to check if this battery is compatible with my laptop?

A: First, find out the part number of your old battery or the model name of your laptop (e.g. 'Compaq Presario R4000CA Series') and match with our product compatibility table. Second, please compare the old battery with our product images to make sure their shapes are the same. Lastly, check the voltage (rating) is the same as the old one. For more details please click How to find one correct battery for my laptop?

Q: Is your replacement Compaq Presario R4000CA Series battery compatible with my original Compaq Presario R4000CA Series battery?

A: 100% OEM compatible to ensure compliance with your original Compaq Presario R4000CA Series battery specifications (the same size, high quality). All of our laptop batteries for Compaq Presario R4000CA Series have passed international certifications (CE, UL, ROHS, ISO9001 / 9002).

Q: How to charge a new battery for Compaq Presario R4000CA Series for the first time use? And how do I keep my laptop battery later?

A: New Compaq Presario R4000CA Series battery pack is usually shipped in a partially charged state. Please discharge your new Compaq Presario R4000CA Series battery pack to 10%-20% and charge it for 3-5 times to fully activate the battery to the maximum rated capacity. In the using process, do not use it less than 20% of the electricity before charging. In addition, if the battery is not used for a long time, please charge it once a month, and keep the remaining power in about 50% then store in a dry and cool environment.

Q: How to Remove, Replace, Install and Upgrade my Compaq Presario R4000CA Series laptop battery?

A: 1. Turn your Compaq Presario R4000CA Series laptop over.
2. Find the laptop battery release button lock for your Compaq Presario R4000CA Series laptop.
3. Now your Compaq Presario R4000CA Series laptop battery is unlocked, locate the battery release button.
4. Press the laptop battery release button, gently pull the battery out of the laptop.
5. Now your Compaq Presario R4000CA Series battery has been removed, please install the replacement Compaq Presario R4000CA Series battery.
6. Insert the battery into the slot. Push your Compaq Presario R4000CA Series battery to the laptop and secure it in place.

High Quality Battery for Compaq Presario R4000CA Series (4400mAh, 6 cells)