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The batteries work together and cannot be selected. It is a total power package. Do not keep the scooter outside in cold weather, Cold weather and lithium ion batteries do like each other. Your useable range will drop like a rock in the cold weather. In cold weather, I noticed when the battery is below 50%, top speed drops off, torque (acceleration) is also noticeably reduced.
Sorry, there was a problem. Please try again later.Hey Mark! Yes, the Segway ES3 Plus external battery charger can charge the internal battery as well; when you plug the charger into the external battery, the smart charging system within the scooter automatically manages the charging of both the internal and external batteries simultaneously. However, the scooter's onboard battery management system is not intended to bypass the internal battery. Hope this helps!
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