A 52V 20Ah battery can last approximately 1 to 4 hours depending on the load it supports. The actual duration varies based on the efficiency of the device and the battery's discharge rate.
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The typical solar battery price in Myanmar for a reliable 20Ah to 80Ah lithium-ion system with built-in BMS ranges from $180 to $650 USD, depending on capacity and brand reputation.
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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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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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