A PIL was filed stating that the vehicles don't conform to motor vehicle laws
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/sc-issues-notice-govt-plea-ban-e-rickshaw
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-standard-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rickshaws
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/battery-vehicles
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/public-interest-litigation-pil
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/supreme-court
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/traffic-accidents
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/transport