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If you plan to use second battery, please note that ES1/ES2 controllers tend to break down as a result. To avoid this you need to make sure you do not charge your batteries all the way up to 100%. We recommend keeping them around 90%.
Additionally, make sure your battery regeneration setting in the app is set to 'Weak'. Also avoid riding downhill when your battery is nearly full. This will make sure you do not provide more energy to the controller than it can handle.