Let's consider the following scenario:
- Friday evening, you come home from work and plug in your Flash to charge.
- Your Flash remains plugged in and unused for a full week.
- A week later, you head out to the garage and turn on your Flash, and discover that it's only partially charged.
What gives? It may seem confusing, but it's fairly straightforward and actually has to do with protecting your battery. Here's what's going on:
The charger that comes with your Flash has built-in protection against over-charging. Once the battery is fully charged (usually about 4-5 hours max), the charger stops providing a charge in order to protect the battery.
Meanwhile (as with most anything that runs on batteries) there is a small, slow drain on Flash's battery, even when the bike is turned off.
Don't worry; it's not enough to be concerned about during the day as you ride around. Over a 24-hour period, you might see a drop of a few percentage points. But if you leave your Flash for a week, let's say, you may see low power remaining on your battery, even if it was plugged in when you left it.
So what's the solution if you want to start out with 100% power? Just top off your Flash by plugging it back in for an hour or two before you ride.
You can also take advantage of Deep Sleep Mode, which fully shuts down your Flash and stops all active battery use. Deep Sleep Mode is intended for longer periods of non-use, like a snowy winter or perhaps a nice vacation. But you could just as easily use Deep Sleep Mode whenever you'd like. See this article for more details on Deep Sleep Mode.