This board is designed and built to help make your Arduino projects mobile. It’s called a Stacker Charger-Booster 5V board. It stacks on top of an Arduino Pro Mini as pictured.
I just finished a couple of these and now that it’s tested I’m ordering a small batch of boards to build more. It’s got a MAX1555 LiPo charger that takes 5-7V input, supports 3.7V rechargeable LiPo batteries, has overrcurrent and reverse polarity protection, and drives your 5V Arduino off the battery when not plugged in. I’ll blog more about these as the next batch is closer to arrival. If you’re interested in grabbing one send an email to longevitysoft at the email provider gmail.com.