Which batteries can be charged in the models?

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Compatible rechargeable Li-ion cells with nominal voltage 3.6 or 3.7 V, including 18650, 20700 and 21700. UNO supports cells up to 71 mm, Onyx 34–73 mm and School 4 up to 73 mm. Ni-MH, Ni-Cd and alkaline single-use batteries should not be charged in them.

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