In a step forward since our last battery guide, three brands of rechargeable batteries now get an extra half a Product Sustainability mark for using recycled content: 1. Energizer: 15%. Only Panasonic and Philipsgot our best rating for carbon reporting. They had concrete targets and discussed steps made towards reducing. All except Panasonic and Philips got a worst rating for their conflict mineralspolicies. Only Philips scored a best. It was continuing to support audited, conflict-free mining in the Democratic Republic of Congo. It also. All the companies, apart from Varta, got our worst rating for Tax Conduct. VARTA stands out for getting a best. Amazon and Berkshire Hathaway (Duracell) are both incorporated in the tax. All of the companies we rated scored our worst rating for their supply chain management policies. Berkshire Hathaway (Duracell) had practically no information. Being so huge, Amazonhas perhaps featured most prominently.