Yamaha 500LI User Manual page 12

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LED battery status indicator (operates when Master Switch is on)
Your Seascooter has a Battery Status Indicator (see Fig. 1 "Parts Diagram" - part 15), which can be seen through the LED Window located in the Handle.
When the battery is full, 3 green LEDs are on. When 2 LEDs are on, 2/3 of power remains. When 1 LED is on and flashing, about 1/3 of power remains.
When all 3 LEDs are off, the machine will run 3 minutes and then will automatically shut down.
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1. User should always try and assume the most horizontal body position for the
best performance results. (see Fig. 28)
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