Lithium Battery’s

[RockyRaab2]

The thing about lithiums is not that there's "more juice" in them than a conventional battery of the same rating, but that the lithiums discharge at full power until they're empty. That's unlike conventional batts that get weaker and weaker as they discharge. Lithiums act more like a gas engine - full power until the tank goes empty, and then it suddenly just quits. That's the reason why (IMO) you really need an app that serves as a gas gauge. Look for a brand that features a Bluetooth Battery Management System and a app for your phone.

One other caveat: Cheaper price on lithiums can mean that they use less than top grade materials.