JUPITERBIKE Portable electric folding bike, Operation Manual

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Battery Care:
5. Do not over-charge or fully drain the battery.
6. Do not cover the charger or battery with anything when charging-
doing so would create a risk of overheating and fire.
7. Keep the battery away from direct sun exposure. If not using the
bike for a long time, charge it at least once every 30 days.
8. Use only the charger supplied in the original packaging. Using
unapproved chargers will void the warranty and can create a fire
hazard.
9. You do not have to fully discharge the battery before recharging it.
However, leaving a fully discharged battery for a prolonged time will
have permanent negative impact on the battery life. Proper charging
of the battery can maintain the battery capacity to a level of 85% after
500 cycles. Due to the characteristics of Li-Ion Batteries, a decrease
of the total capacity over the course of time is inevitable.
10. Short circuiting the battery will void the warranty & be a fire hazard.
11. The battery should be stored at no more than 120°F or less than -4°F.
Never put the battery into a fire. Always dispose the battery according
to local laws and regulations. Please charge for 2 hours and do not
fully drain the battery. The battery will achieve optimal performance
in normal temperatures and environments