pxt-ev3/docs/reference/brick/battery-level.md
Galen Nickel 822227eb48 Brick ref topics 02 (#283)
* Add brick button topics

* Add the rest of the brick api
2018-01-30 20:58:18 -08:00

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Markdown

# battery Level
Return the current battery level.
```sig
brick.batteryLevel();
```
## Returns
* a [number](/types/number) which is the current charge level of the brick's battery. This is a percentage of total charge left in the battery.
## Example
Show the battery level percentage on the screen. Also, show a green light if the battery level is above 15%. If the battery level is below 15% but above 5%, show a orange light. But, if the battery level is below 5%, show a pulsing red light.
```blocks
let battery = 0;
loops.forever(function() {
brick.showString("Battery level:", 1)
brick.showNumber(battery, 2)
battery = brick.batteryLevel();
if (battery > 15)
{
brick.setLight(BrickLight.Green);
} else if (battery > 5) {
brick.setLight(BrickLight.Orange);
} else {
brick.setLight(BrickLight.RedPulse)
}
loops.pause(30000)
})
```