In this paper, we propose Interaction-based Power Transfer (IPT): a novel power scheme for power-as-needed devices (i.e., devices that only require power during interaction).  ...  TouchPower transfers on-body power to off-body power-as-needed devices through contact between electrodes on a glove worn by the user and those on the target device during the interaction process.  ...  ACKNOWLEDGMENTS The authors would like to thank Qi Zou and Ruolin Wang for their help in this paper. The authors would also like to thank the anonymous reviewers for their valuable comments.  ...