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Can anyone recommend a rechargeable battery for the Edison's real time clock on V_VBAT_BKUP? The Edison Compute Module Hardware Guide says on p37 that the RTC battery backup is charged at 2.5V and 10uA by default. I was expecting to use a rechargeable coin cell, but all I can't find one that will charge at 2.5V. Most coin batteries seem to be beyond even the highest selectable recharge voltage of 3.3V. This makes me think I'm looking at the wrong type of cell. I'd like to use the default 2.5V charge voltage if possible.
Please note that I'm asking about the real time clock battery, not the battery that would power the Edison on VSYS.