42WH WY9DX Laptop Battery For Dell Latitude 5420 5520 005R42 0M3KCN 01K2CFSpecifications:

*Condition: Brand New , 'A' grade cells,100% Compatible!

*Battery type: Li-ion Battery

*Voltage: 11.4V

*Capacity: 42Wh

*Number of Battery Cells: 3
*Life Cycles (times):300-500

*Certification: CE FCC RoHS

*Color: black as pictures

*Operation time: approx 1.5-3.5 hours

*Package including: 1×battery (in packing box)

Compatible Part Numbers：

• WY9DX
• RJ40G
• 01K2CF
• 075X16
• 0WK3F1
• 0M3KCN
• 005R42

Compatible Models: (use "Ctrl+F to find your model quickly")

• For Dell Latitude 14 5420 series;
• For Dell Latitude 14 5420 CHKFM;
• For Dell Latitude 14 5420 FDTCY;
• For Dell Latitude 14 5420 XPC5H;
• For Dell Latitude 15 5520 series;
• For Dell Latitude 15 5520 39V1H; for Dell Latitude 15 5520 FPKNM;
• For Dell Precision 15 3560 series;
• For Dell P137G P137G001;
• For Dell P104F P104F001 P104F002;
• For Dell Precision 15 3560 3H45Y; for Dell Precision 15 3560 4MTF7; for Dell Precision 15 3560 758J7; for Dell Precision 15 3560 7RV10; for Dell Precision 15 3560 F3T9T.

Note:Please check carefully about your laptop model name/battery part number/battery shape and size to make sure you purchase the correct battery.

How to install a new battery:

1. You need to turn off the laptop and disconnect the power.
2. Disconnect the connection between the old battery and the motherboard to avoid unnecessary damage due to the removal of 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 box, tighten the screws, and then connect the wires of the new battery.
4. If you have questions about installing a new battery, you can search for the installation of laptop/tablet models on YouTube. This method may help you.

For Optimal Use battery:

1.Discharge the new battery to 5% (not 0%), then charge and cycle 3-4 times to get the new battery a full capacity.
2.The important point is to perform a full discharge charge every other month to extend battery life.
3.Don't connect adapter for a long time while using the battery. It may damage the battery.
4.Avoid artificial shocks, disassembly, crush or puncture. Do not dispose of in fire or water.
5.Avoid using the battery in an environment where the temperature is too high or too low.

PaymentDelivery detailsTerms of salesAbout usWarranty PolicyPayment1. We accept payment via PayPal, Visa, Mastercard, Apple Pay, Google Pay etc.2. All payments must be prepaid.Delivery detailsDeliverDel Shipping timeItem located in California and New Jersey of Unites States of America, there are 2 warehouses.Usually, delivery time less than 7 days in California. Except holiday, weekend, weather delay etc.Other states in U.S.A, the whole shipping time may be in 7 to 15 working days.Package sent from which above warehouse according to inventory stock quantity , and post address distance.Send us message if you have shipping time request before you pay, such as send item through other shipping methods.The whole shipping time is an estimated time, it may be different with actual situation. Hope you understand and be patient.1 to 3 days shipmentCurrently, delivery successful in California Only. Other states in U.S.A, it may be later delivery in 3 days. Hope you consider carefully before select this shipment. ivery detailsy detailTerms of salesOrder cancellationAt purchase history , find paid order and send cancel request. Usually, request would be agree in 24 hours.Item sent , request failed. Let seller know your request through message, try decline package , or ask seller send return label, or provide other better solution.Revised addressPlease send message to us, if you forget revised. If you have not received our reply in time,It may be our service officer is rest .ReplacementWe accept 30 days return and refund request, after you get item.You would get a brand new item, or refund full payment, if item is defective.It is better hassle return request through message, and provide photo at message.. We set automatically respond to return request, it may be cause solution is not your and our expected. For example, you want replace item, asked buyer return and refund.ExchangeSend message to us, it is better provide photo at message. you would get correct item finally, get return label after exchange, Please help us return this wrong item.About usWe are specializing in selling laptop batteries, ac adapter/charger etc. for about 10 years, and we are the best seller on these categories for years.All item passed FCC / CE / ROHS certificates. Help buyer reduce the risk of damage, fire, dangerours mostly.We work with good supplier who supply good quality materials and products and we have 2 factories producing most of our products, we are confidence to provide very good quality products with competitive price.Warranty PolicyAbout Warranty- You don't need to pay for for getting covered by our warranty policy.- There is a warranty label on our products like batteries and adapter chargers, please keep it safe and sealed.- We don't cover the failure or damage caused by misuse, accident, modification, inappropriate physical or operating environment, natural disaster, power surge, and improper maintenance or storage.- If you misuse the Return Policy, our warranty to your purchase will be revoked.- Please contact us via message if you have any problem and please allow us 24 hours to reply, we will do our best to help you solve it.

On Aug 10, 2026 at 18:47:36 PDT, seller added the following information: