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What is the shelf life of lithium-ion batteries before they need to be checked or charged?

If the battery modules are connected together, i.e. installed in a cabinet, the storage times are six months at 25 degrees C. This is due to parasitic losses from the BMS.

If the battery modules are NOT connected together (either power or communication connections), then the storage times are one year at 25 degrees C.

Note: Samsung requires a "voltage check" of the batteries every 180 days during storage.