The Vertex Standard FNB-V103LI has been replaced by the FNB-V131LI UNI Battery Pack.

This is a Lithium Ion battery pack rated at 1150 mAh and has an average run time of 9.0 hours (7.3 hours w/o saver). It works with the VAC-300B charger, VAC-6300B multi-unit charger, or other equivalent chargers. It does not work with the new UNI chargers that Vertex introduced in August 2013.

You can upgrade to a longer life battery pack by ordering the FNB-104LI which is a 2000 mAh Lithium Ion battery pack that will have an average run time of 16.5 hours (13.5 hours w/o saver).