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I need to make a momentary electronic switch that will connect a 3.7v battery to a connector that will connect to either a 2ohm resistive load, or somehow bypassing the switch, a charger to charge the battery (charging at 1Ah).

The circuit must be able to fit on a board of no more than 15mm X 6mm

A similar real world example of the kind of switch would be one found in a miniature pocket LED torch (although I need much higher current)

Can you explain more details ?

A sketch circuit diagram would help.

:)