Battery Life

Battery life is rated for 2-3 days, but given the number of sensors and possible future updates battery life can be severely impacted. My recommendation is to always top off/charge the lithium ion battery as will extend it's life. Because of the waterproof aspect I would even let the unit charge in cool water to aid in keeping mechanism cool while heating. Heat regardless of what technology can hurt an electronic item.

Total charging time for near dead battery is roughly 1.5 hours I never let it dip below 60% (now 40%) and try to recharge it as soon as I'm near an inductive charging source.

Batteries are only recharged through inductive charging, Be aware that other chargers may not work if there is not enough inductive mass to trigger a charge. The inductive coil in the band is located under the logo, placing the device with sensors up will allow it to charge. For the included charging puck this will turn the green light to blue while charging.

There is currently a % indicator bug that will report the device at at a falsely low %...I've personally seen it at 100% but I generally go by the blue light. One way to tell that it's the bug is if the % jumps rapidly when you put it on the charger.The puck will turn green once the amiigo is fully charged.

NOTE: Because it uses lithium ion batteries the following recommendations is a reminder in case you confuse the usage as compared to a ni-cad battery. Lithium ion does not have a memory issues and is not recommended to deeply discharge the battery. The battery life will last longer and you will be able to use the product longer as the battery is not replaceable. Technically you could fix it but it would no longer be waterproof and servicing would be likely be more expensive than buying a new one.