The resistor R1 in Fig 2 emulates Venus. The Venus chip takes 28mA, or say 32mA maximum. The LM317L charger shown here is capable of delivering this power into Venus at 3.07V.
The Venus power supply range is 2.8V to 3.6V
A simplest battery charger based on LM317L. The regulator is limited to 100mA, therefore charging current and load current should not exceed 100mA OR the regulator will heat up, it might be possible that LM317L get burn. Fig 2, shows 78mA current flowing through load from battery, while there is no power source is attached.
Comments are welcome to enhance this model.
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