Advanced Battery Design and Assembly in the UK by Specialists PMBL. PMBL is a UK based Custom Battery Pack Design, Manufacturer and Assembly company that specializes in Advanced Battery Design and has worked with many innovative technology and electronic companies to deliver the optimum battery design solution for each of their individual, bespoke business or product requirements. As an advanced technology and design, customer focused, battery pack manufacturer, PMBL makes every effort to provide the complete advanced battery technology design, procurement and manufacturing process for a broad, eclectic range of batteries including NiMH and ATEX intrinsically safe applications.