Shimano STEPS E8000 Originalbetriebsanleitung Seite 109

Your fitness level: The fitter you are, the less assistance you will need.
Total weight: The lower the total weight supported by the bike, the easier
it will be to ride  VI.I Overall weight Page
Outside temperatures: The lower the outside temperatures (e.g. cold in
winter), the shorter the range.
Route selected: You need to pedal harder when cycling uphill or against
strong head wind. This is registered by the power sensor, which in turn
requires the motor to work harder.
7.3.2 Storage
1. Store the pedelec in a dry, not excessively warm room. The battery
should not be exposed to direct sunshine. The recommended storage
temperature range is 18 to 23 °C.
IMPORTANT
The battery should not be stored in a fully charged state. A charge
level between 50 and 70% is ideal. Since the battery loses charge
very slowly, you should recharge it when only one or two segments
are lit, but after six months at the latest.
EN-10.
8. Battery charger
8.1 Safety information
DANGER
Battery chargers are not a toy and must not be used by children
under the age of 8 years. Older children must be sufficiently trained
on how to use the battery charger. People who, because of their
physical, sensory or intellectual capabilities, or because of their lack
of experience or knowledge, are unable to use battery chargers, are
prohibited from using them unless supervised or under the instruction
of a responsible person. Otherwise there is a risk of mishandling with
consequential very serious injuries.
WARNING
Only use the correct, original charger to charge the battery. The use of
other battery chargers can cause explosions, serious burns and fires.
Further consequences can include malfunctions and a limited battery
life. You can find a list of permitted chargers in  9.4 Charger Page
EN-57.
Only charge the correct, original battery with the charger. The use of
other batteries can cause explosions, serious burns and fires. Further
consequences can include malfunctions and a limited battery life. You
can find a list of approved batteries in  7.2 Technical data - battery
Page EN-48.
Original User Guide | Pedelec Shimano Steps E8000 Version 1 EN-49