4 V lithium battery is generally as follows: Nominal voltage: 7. This is the voltage output by the battery under ideal conditions, usually marked on the battery.
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It can be a strict low-voltage cutoff, a surge that exceeds the BMS limit, or a simple voltage drop in the cables. Treat this as a short, repeatable test plan. The inverter can click off when a compressor or pump starts.
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The lithium battery block itself had two USB ports and a digital readout on how much power remains in the battery. It's more than just a phone backup battery.
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15°C to 25°C (59°F to 77°F) — cool, dry, and stable. Freezing conditions (<0°C / 32°F): Can cause lithium plating inside the cell. High humidity: Leads to corrosion and oxidation at battery terminals.
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