Battery 2-Pack for Plantronics CS50, CS55, HL10, HeadsetsCompatible with the following devicesPlantronics CS50Plantronics CS55Plantronics HL10Plantronics CS351NPlantronics CS361NPlantronics CS50-USBCompatible with Part NumbersPlantronics CS50 Battery65358-0164399-0164327-01PLN-6439901ED-PLN-643990165358014600003XA51000100 2-PACK of Replacement Batteries forPlantronics CS50 Wireless HeadsetRechargeableExtend the use of your headset with this brand new high-capacity battery 2-PACK! High-capacity means more power and longer use of your headset! And that means more use with a single charge!*Just imagine how nice your headset will perform with this fresh new battery! All of our batteries are high-quality and brand new! Search Tip: An easy way to search for your model in this list of compatible models is to use the "Find" feature of your browser. The easiest way to do is this, using Windows based browsers, is hold Ctrl+F. When the window pops up type in just a portion of your model number and click Find Next. It will automatically find anything on the page with those characters. Fits the following headset models:Plantronics CS50Plantronics CS55Plantronics HL10Plantronics CS351NPlantronics CS361NPlantronics CS50-USB Compatible with other battery part numbers: Plantronics CS50 Battery65358-0164399-0164327-01PLN-6439901ED-PLN-643990165358014600003XA Technical Specification: Capacity: 300 mAh 3.7V (1.11 WHr) Construction: Made with the highest quality Japanese cells! Dimensions: 1.4" x .75" x .14" inch (LxWxH) Condition: Brand New, 100% OEM compatible. Type: Li-Polymer, No memory battery! Quantity: 2Replacing your headset battery is easy!We've sold this battery to hundreds of satisfied headsetowners who replaced their battery on their own. You can too!Buy this battery right now and start enjoying your headset to its fullest potential!*To ensure our battery has a higher-capacity, compare the mAH rating of your current battery to ours.Run time may vary depending upon LCD Brightness and other factors not related to the battery such as: features used, battery age & condition, charging habits, temperatures battery exposed, amount of time on standby and actual use time, etc. Capacity: 240 mAh 3.7V (0.9 WHr)Dimensions: 35.55 x 19.04 x 3.55 mm (LxWxH)Construction: Made with quality Japanese cells! Condition: Brand New, 100% OEM compatible!Type: Li-ion Battery