In SX Microcontrollers, SX/B Compiler and SX-Key Tool, william wrote:

You cannot use a regulator, b'cos the regulator may take up to 3mA even when the SX is asleep at a few microamps, so it defeats the prupose of sleeping.
At 3mA regulator leakage for the 78L05 ( small ) regulator, the coin battery will finish in less than 24 hours.

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