The Redstone Energy Cell uses Molten Redstone to store BuildCraft energy (Minecraft Joules). Input and output amounts can be configured, both allowing up to 100 MJ/tick to either be put into the cell (input) or how much the cell gives out (output). It can hold up to 600,000 MJ.
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If dismantled (Sneak + Activate) with a BuildCraft compatible Wrench or Crescent Hammer, the energy will remain contained in the Redstone Energy Cell. Using a pickaxe will lose all the energy stored in the cell.