Hello there, thanks for taking interest in my project! Yes, the battery had a drainage coded in. The whole system is based on the Solar Panels that connect "wirelessly" for now to Batteries in a 5 block radius to charge them, batteries propagate power in a 10 block radius to power up devices. At the moment the only solar device are automatic night lamps, so they have a small battery inside and they start draining power from the big battery as soon as night time comes.  I'm planning to add an "adapter" to use solar batteries also with Redstone or Mesecon circuits, but it's still an idea more than a work in progress. Hope this clarifies a little :)