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We eventually abandoned the idea of providing power for both an implantable lamp and a biopotential sensor from the same battery. We were able to isolate the sensor from the lamp power by loading two batteries and an optical isolator onto the implant, but the result was cumbersome. And in any case: it is not clear that there is any need for an animal implant that detects biopotential events, such as an epileptic seizure, and responds with optical stimulus. In animal studies, the detection and response can be managed outside the animal, in an external and much more powerful computer. Our solution to the detection and stimulus problem is to implant two separate devices in one animal: an Implantable Stimulator-Transponder and a Subcutaneous Transmitter.