The invention relates to a process for preparing pentabromobenzyl acrylate through the reaction of pentahalobenzyl halide with a salt of acrylic acid in water-immiscible solvent, wherein said salt is in aqueous form and the reaction is carried out in the presence of a phase transfer catalyst. Importantly, the open circuit voltage of the freshly built primary lithium oxyhalide cell is equal to or less that the open circuit voltage of the lithium ion cell in a fully charged state. A delay unit for receiving a predetermined delay factor for each of at least some of the user nodes, the delay factor representing a level of tolerance to a time delay. These circuits can be transferred onto a conductive glass of the panel and subsequently onto source driver chips of the thin film substrate of the COF.