Turning E-Waste into Light

IBM India researchers report that disused laptop batteries can cut the cost of bringing power to those without access to the grid

2 min read

Turning E-Waste into Light
A Bangalore street vendor holding an UrJar prototype.
Photo: IBM Research India

Bangalore-based IBM Research India has a bright idea for keeping discarded lithium laptop batteries out of landfills: repurposing their cells as energy supplies for the powerless. The idea, presented at this weekend's fifth annual Symposium on Computing for Development (DEV 2014) in San Jose, has passed a small proof-of-principle test run with Bangalore's working poor.

The IBM researchers used disused lithium batteries to create a new device they dubbed the UrJar—a multilingual monicker uniting the Hindi word urja for energy with jar. Hardware R&D firm Radio Studio, India, built the units. The first phase was tear-down. Radio Studio disassembled laptop batteries to isolate those cells that could still hold several hours' worth of charge—over 60 percent of cells on average, according to their sampling.


Cells that passed quality control were repackaged in a housing with basic electronics, starting with a charging circuit to limit the rate and level of charge on the lithium cells and thus minimize fire risk. Buck converters and a boost circuit feed power jacks for a variety of DC devices including cell phones, LED lights and small fans. 

Testing by one non-electrified Bangalore resident and four street vendors led to favorable feedback after use of an UrJar for between one week and three months. One street vendor, who previously relied on a battery-powered compact fluorescent light at night, reported that he could keep his shop open two hours longer by using the UrJar powering an LED light. 

Mohit Jain, a member of the IBM group, told Technology Review that "the main request was for rat-resistant wires and brighter bulbs." 

At a production volume of 1,000 they figure they can turn out UrJars, including a 3 W LED light and a mobile charger, for 600 rupee ($9.70). That is one half to one-third the cost of the rechargeable portable lighting devices marketed in Bangalore, most of which use shorter-lived lead acid batteries. Participants in the IBM study reported they would pay 1,000 rupees to own an UrJar.

That suggests there could be plenty of demand. According to the IBM paper there are more than 400 million people in India without power, including 45 percent of rural households. They envision rural residents charging UrJars at centralized solar-power stations.

There is certainly no shortage of tossed batteries to fuel this vision. The IBM paper estimates that 142,000 computers are discarded daily in the U.S. alone, while one large multinational's India operations alone discarded more than 10 metric tons of laptop batteries last year. 

BBC highlighted India's growing indigenous e-waste problem in reporting on the UrJar last week, citing one estimate that its IT sector generates 32 metric tons of e-waste per day. That's a lot of UrJars. 

The IBM team asked that we acknowledge all of the project's "co-leads": VikasChandan, Mohit Jain, Harshad Khalidkar, Zainul Charbiwala, Sunil Ghai, Anupam Jain, and Deva Seetharam, plus Rajesh Kunnath with RadioStudio.

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