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lithium
You could try to create a negative voltage of 0.6V, and connect the minus of the battery to that, subtracting 0.6V when the system is running: diode clocksignal -----||----.----KA-------.------.---------.---- -0.6V to minus battery 10nF | | | | | | K diode | 100K 10nF A 1M | | | | | | | | gnd -----------'-------------'------'---------'---- GND
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Don't know if it works.
I vagely recall another method of generating a few 100mv negative, with just one transistor in a rather strange configuration. Just can't remember how ;)