Best AnswerIt is indeed possible, but you'll need to get your hands a bit dirty with the Fitbit API.
https://wiki.fitbit.com/display/API/API-Get-Device
Collin | Los Angeles, California
One, Charge HR, Aria - Android 5 (Moto X), Mac
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The developer APIs are for accessing information on Fitbit's server, which contain data as of the most recent sync. If you are not a developer, it is not for the faint of heart.
Recently, Fitbit also opened up a channel on IFTTT (If This Than That) but I don't think one of the triggers is the battery level. Otherwise this would be a very easy way to do your own logic when the battery is low.
Other options to consider:
1) In your settings (website gear icon) visit Notifications > Low Battery and enable SMS or email
2) At the bottom of each webpage is a link to an App Gallery, one of which is a low battery notifier
See https://www.fitbit.com/apps/lowbattery
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