OP: "But there's some missing info, such as what is involved in charging it?"
Battery and charging quotes from Wiki:
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Available in three models, starting at €6,990 up to €8,490 (in the UK: GB£6,990 to GB£7,400),
the Twizy sales price does not include the battery pack, which is leased for a monthly fee that includes roadside assistance and a battery replacement guarantee..
....
The 6.1 kWh (22 MJ) lithium-ion battery is located underneath the front seat. Both motor variants carry the same weight of 474 kg (1,045 lb),[21] including batteries of 100 kg (220 lb). The range is homologated at 100 km (62 mi). In real conditions, Renault announces around 80 km (50 mi). In worst conditions (high speed, no eco-driving), Twizy can reach 50 km (31 mi).
The battery can be charged with an extendable spiral cable stored beneath a flap at the front of the vehicle. The integrated charger is compatible with roadside battery charging facilities as well as the standard 220-240 V 10 A household electrical supply. Charging an empty battery takes around three-and-a-half hours.
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(I deleted my remark about $5.96 for a recharge.)
It actually sells:
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The Twizy was the top-selling plug-in electric vehicle in Europe during 2012.[9] The milestone of 15,000 Twizys sold worldwide was achieved in April 2015.[10] Global cumulative sales totaled 21,874 units through December 2018, with Europe as its main market.[11][12]
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The Wiki article also includes a discussion on safety and winterizing.
Terry, 230RN
REF:
https://en.wikipedia.org/wiki/Renault_Twizy