Added new Li-ion battery pack to the battery pack page

Polman Minerals will no longer be selling NiMH battery packs.  Instead we have switched to these new high-quality Li-ion packs. The packs are rechargeable and are 14.8-volt and 5.2 amp/hour.  They come complete with a barrel connector and soft Velcro on one side of the pack.  The pack weighs only 13.2 ounces, making it ideal for field use!  For more information on the battery packs as well as charging units and other accessories, please follow the link for battery packs.