BT Charger is an innovative (and potentially a blockbuster) app which the developer claims to actually charge the phone’s battery using electromagnetic radiation in the surroundings and Bluetooth hardware of the phone – aptly called as electromagnetic harvesting. Dennis Siegel, the developer of BT Charger explains the science behind the app as follows (excerpt from his site) –
The omnipresence of electromagnetic fields is implied just by simple current flow. We are surrounded by electromagnetic fields which we are producing for information transfer or as a byproduct. Many of those fields are very capacitive and can be harvested with coils and high frequency diodes. Accordingly, I built special harvesting devices that are able to tap into several electromagnetic fields to exploit them. The energy is stored in an usual battery. So you can for example gain redundant energy from the power supply of a coffee machine, a cell phone or an overhead wire by holding the harvester directly into the electromagnetic field whose strength is indicated by a LED on the top of the harvester.
Depending on the strength of the electromagnetic field it is possible to charge a small battery within one day. The system is meant to be an option for granting access to already existing but unheeded energy sources. By exploring these sources it can create a new awareness of the invisible electromagnetic spaces while giving them a spatial dimension.
The app description says –
“This app is designed to charge smartphone from the Bluetooth antenna. It is based on electromagnetic induction. A potential difference (voltage) appears across a conductor in BT-antenna when it is exposed to a varying magnetic field. This app uses that voltage to charge your smartphone.“
Interface of BTCharger is simple having just an “Enable Bluetooth” toggle button. Enabling this option power on phone’s bluetooth and the battery icon start showing charging status. But the catch is that the charging process will be satisfactory only if the phone is close to the strong electromagnetic field (like near overhead electric cable, working electric appliances etc). Also the app must continue to run in the background to charge the battery thus do not exit the app rather press menu button to come out of it. You can download BTCharger (unsigned) free for Symbian from here. It is compatible with all Belle/Belle Refresh/Belle FP1/FP2 phones (Nokia N8, 701, 603, 808PV etc).
However there are some questions in my mind regarding BT Charger –
1. Bluetooth itself drains the battery very fast then what is the point of charging and discharging at the same time?
2. Besides the running app also consumes battery so if the rate of charging is too slow then it is useless?
Considering all these issues all I can say is that BT Charger is a very promising app(roach) which still needs a lot of improvement to be considered a solution of the eternal battery problem of portable gadgets (including mobiles). But hats off to the developer for materializing this concept (of tapping an easily available source of energy).
Update – Its an April-fool act from app developer Kolaysoft! BTCharger is a prank app which fakes the battery charging. Hope you enjoyed the idea and the app……Dennis Siegel or his site has no connection with it!