So [Travis] decided to upgrade it to make use of the ever-so-common, 18650 lithium-ion battery. Not looking to purchase any components [Travis] performed this hack using simple recycled household ...
French researchers have announced a prototype of an 18650 sodium-ion battery ... By comparison, a typical lithium-ion battery has around 110 Wh/kg and tops out at about 1200 recharge cycles.
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