BQ27426: BQ27426 SRP pin存在电压而VBAT没电压情况时是否存在漏电

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This looks like it's violating the abs. max. (VBAT + 0.3V). The gauge has ESD protection diodes hence if you forward bias them with a circuit that violates abs. max., you'll measure excessive current (and risk permanently damaging the part because those structures aren't designed to carry 3mA).