Those hard-working folks at Spark Fun Electronics have taken a good thing and made it better. By taking three of their 2000mAh 3.7V polymer lithium ion batteries and wrapping them up together, they have created a 6Ah powerhouse battery pack (#PRT-08484; $39.95). This is a parallel battery circuit. Also, rather than having to contend with those pesky solder tabs that are inherent to most LiPoly batteries, this Spark Fun power pack is terminated in a convenient JST connector. Oh, and if you don't like JST connectors, just snip the connector off and solder on your preferred connector.