Perfect Compatibility: Direct replacement for Dell Latitude 5420/5424/7424 Dell P85G P86G P137G P137G001 P137G002 P85G001 P86G001 Series. Matches part numbers: 7WNW1, DMF8C, 0DMF8C, DMF0C, GK3D3, 0GK3D3, 6NNCF, DP3KF, 451-BCHV (Check your old battery’s label before purchase). 51Wh High Capacity: 3-cell lithium-ion battery provides 8-10 hours runtime (varies by usage) with 1000+ charge cycles, outperforms standard 3-cell batteries. Multi-Protection Safety: Built-in circuit guards against overcharge, overheating, and short circuits. CE / RoHs / FCC certified. Notice Before Order: In order to avoid choosing the wrong model, please check your laptop model before placing an order. Open the back cover of the laptop to confirm the battery model, while press [CTRL + F] to search for your laptop model/part number. Compatible laptop models and part numbers of compatible batteries and laptops are listed as following in product details. Warm After-Sales Support: SBL provides 12-month warranty, full refund or replace within 30 days and 24/7 customer service. Designed to meet or exceed OEM specifications, this 51Wh battery delivers reliable power for business laptops and mobile workstations. Technical Specifications: Battery Type: Lithium-ion (Li-ion) Capacity: 51Wh / 3900mAh Voltage: 11.4V Compatible Models: Dell Latitude 7424 / 5424 / 5420 Rugged Extreme Series Dell P85G P86G P137G P137G001 P137G002 P85G001 P86G001 Series Replacement Part Numbers: 7WNW1 / DMF8C / 0DMF8C / DMF0C / GK3D3 / 0GK3D3 / 6NNCF / DP3KF / 451-BCHV Package Includes: 1x Battery, User Manual, Toolkit Important Notes: for optimal performance, fully charge and discharge the battery 3 times after installation. This is a third-party replacement battery (Not original Dell product). CAUTION: Do not dispose of in fire, but keep the battery away from fire. Do not directly connect (short circuit) the posite(+) and the negetive(-) terminals. Never attempt to disassemble or reassemble the battery pack. Do not use chargers other than the designated one to charge this battery pack.