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The simplest, most robust solution is to use a larger non-rechargeable battery; an 800mAH battery, such as a CR2 3.0V industrial lithium should give you up to 10 years of working life, limited only by the battery, not the zymkey power consumption.
A CR2 (or something of similar capacity) can be connected to the Zymkey with an adapter, such as below.
Make sure to use a 3.0V battery, not 3.6V
Let us know if you need help sourcing the battery/adapter; we can make direct contact with you, or send to info@zymbit.com.
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