Not just the Twizy,but EV’s in general. The lithium batteries are better charged often then when they are getting empty.
These batteries do not suffer from memory effects quite the same as old nickel cad ones. In fact they will last longer if they are topped up more. A10% discharge can be done 1000s of times, while a 90% discharge will affect the batteries in a few 100s of charges.
Depth of discharge Discharge cycles Table 2: