NOVELTY - Energy storage battery comprises an electrochemically inert and electrically insulating substrate; an anode located on one side of the substrate and a cathode located on the other side of the substrate, where the anode and cathode form electrodes which are located substantially co-planar and co-parallel to one another; a gap located between the anode and cathode which is capable of electrically insulating the anode and cathode; a spacer defining a channel along the anode and cathode electrodes parallel to the gap between the electrodes; and an electrolyte deposited in the channel.    USE - The energy storage battery is useful in renewable power industry; energy storage in supporting traditional power generation when in excess; electric vehicle power; uninterruptable power supplies; and in domestic power storage and supply supporting home wind/solar power generators and consumer electronics.    ADVANTAGE - Improved energy storage battery system is provided. Failure mode is mitigated in a co-planar battery design since if dendrites form they would be restricted by the insulating substrate, and the battery is designed to have sufficient gap between the negative and positive electrodes to prevent any lateral dendrite growth reaching the opposite electrode. This coupled with the potential for the battery design to be operated with reversible negative and positive electrodes for certain chemistries opens up a range of desirable chemistries which otherwise cannot be employed in applications requiring long cycle lifetime.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method of manufacturing an energy storage battery involving providing an electrochemically inert and electrically insulating substrate; providing an anode located on one side of the substrate and a cathode located on the other side of the substrate, where the anode and cathode form electrodes which are located substantially co-planar and co-parallel to one another; providing a gap located between the anode and cathode which is capable of electrically insulating the anode and cathode; providing a spacer defining a channel along the anode and cathode electrodes parallel to the gap between the electrodes; and providing an electrolyte deposited in the channel.