Eunicell IoT Batteries
1.5V alkaline battery, 3.0V lithium battery, 3.7V li-ion rechargeable batteries,3.7V li-poly rechargeable battery

Also at the periphery of the Internet of Things are some wearable accessories with similar power profiles, such as heart rate monitors that communicate data back to a sports watch or smartphone. Some wearables are able to harvest enough energy from the wearer’s movements that they can use this to power their electronics, however, energy as a power source can be unpredictable and may not coincide with the active period for the electronics. Most energy harvesting devices therefore require a rechargeable battery which is charged by the energy harvesting subsystem, so that energy can be used as and when it’s needed.