还是拆下来去walmart或autozone检查或者充电吧。
如果有常用的测电表，可以自己先量量电压。参考数据见下表
| Open Circuit Voltage (12 V) | Open Circuit Voltage (6 V) | Approximate charge | Relative acid density |
|---|---|---|---|
| 12.65 V | 6.32 V | 100% | 1.265 g/cm3 |
| 12.45 V | 6.22 V | 75% | 1.225 g/cm3 |
| 12.24 V | 6.12 V | 50% | 1.190 g/cm3 |
| 12.06 V | 6.03 V | 25% | 1.155 g/cm3 |
| 11.89 V | 6.00 V | 0% | 1.120 g/cm3 |
The open circuit voltage, is measured when the engine is off and no loads are connected. It can be approximately related to the charge of the battery
