Note : 18V and 18.5V are compatible, they are in common use.

Buy with confidence! Our Website is your source for high quality Milwaukee batteries for Power Tools. This brand new 54Wh(10 cells) replacement Milwaukee 2820-21WS Li-ion battery is made with high quality cells from Samsung. Each replacement power tool battery for Milwaukee 2820-21WS has been tested on the Milwaukee device before being dispatched and is 100% compatible with the original manufacturer's specification. When you buy our replacement Milwaukee 2820-21WS battery, you're buying trust!

Safety and Excellence Features of Our Replacement Milwaukee 2820-21WS batteries:
1. No memory effect, fast charge
2. Smart internal circuit board and Low power consumption IC design
3. Tested with strict quality control standards and meet or surpass OEM specifications
4. Certified by CE, UL, ROHS, ISO9001/9002
5. Cell-unbalanced-shut-off protection
6. Over-charge protection and Over-discharge protection
7. Over-heat protection
8. Over-current protection
9. Short-circuit protection
10.High capacity circulatory function (about 600-800 cycles)

Welcome your patronage and thank you for purchasing this high quality replacement Milwaukee 2820-21WS power tools battery at Laptopbattery.com.sg! Before placing an order, please make sure that the part number of your old Milwaukee 2820-21WS battery is listed as below and has the same shape as our replacement 2820-21WS battery's images (please view the larger images for details).

Product Larger Images

Compatible Milwaukee Part Numbers

Compatible Milwaukee Power Tool Models

Shipping Methods

Payment Methods

Warranty

1-Year Warranty
All our high quality replacement power tool batteries for Milwaukee 2820-21WS 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 Power Tool?

A: First, find out the part number of your old battery or the model name of your power tool (e.g. 'Milwaukee 2820-21WS') 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 Power Tools?

Q: Do I need to charge the new Milwaukee 2820-21WS battery for 12 hours for the first time use?

A: No. Lithium-ion batteries have no memory effect, so it’s the right way to charge and discharge normally.

Q: How to properly charge my Milwaukee 2820-21WS battery?

A: Please avoid exhausting the battery power and then recharge, because it will bring a lot of damage to your battery. Therefore you have to charge it when remaining power nearly 10-20%. In addition, if your battery has not been used for a long time, please charge it once a month, and keep the remaining power about 40% and then store in a dry and cool environment.

Q: How to care for my Milwaukee 2820-21WS power tool battery and extend its life?

A: 1. Complete discharge would damage the life of the battery for power tools.
2. Please keep the power tools as dry and cool as possible.