Listing is for a 2-pin laptop cmos battery. These work with any brand laptops (dell, lenovo, acer, hp, etc...) as long as the battery connectors match. The connector is shown in the photos.

Item Features
Great Part to replace the broken and non working CMOS Battery for Latitude M4600 M4700 M4800 M6600 M6700 M6800
High capacity  battery
The real time clock battery CMOS BIOS backup battery with two wires two pin connector
Will fix the following error codes: Systems battery error / System CMOS checksum bad / System Timer error / Real-Time Clock Error 
2 Wires - 2 Pin Connector
Voltage: 3V
Length: 6.5 cm