This is the advanced circuitry Ultra Motor 36V 4A Li-Ion Charger.
If you forget to charge your bike for a few months or if the battery runs extremely low, the circuitry in this charger will still sense your battery's lower voltage and will 'pre-charge' it up to its usual operating voltage.
If you use your A2B for commuting, my recommendation is to buy an extra charger so that you don't have to carry the thing back and forth
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