You're more likely to deal with uneven self-discharge that will take the batteries out of balance while in storage, and you'll need to jack with them before putting them back into service. If you really want to discharge, a standard 120VAC 60W Incandescent or halogen light.
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Temperature Guidelines: Most solar batteries, particularly lithium-ion, function best between 32°F (0°C) and 95°F (35°C). Storing them outside these temperatures risks reduced efficiency and lifespan.
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Normal: Discharge to 10–30% SoC for interim storage; 0–10% before compliant ground/sea shipment, if packaging permits. Suspect: Supervised discharge to ≤10%. Stop immediately if surface temperature rises > 10 °C above ambient, if odor appears, or if a cell swells.
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For utility-scale containers (4-hour duration), the initial capital investment is currently between USD 200/kWh and USD 300/kWh, by location. These are for battery + pack + basic electronics.
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