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If no battery is used for M218, how long can M218 keep program and retain data.

The battery of M218 only supply for RTC, doesn't power for M218 Flash (store application) and FRAM (store retain data), so no relationship between battery and program storage and retain data. For retain data, the mechanism of M218 is diffrent from M238, M238 has a internal battery, but M218 do not have. When M218 is powered off, M218 has a capacitance to last power for some time to storage retain data from RAM to Flash. 
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