GP645 
| Cells Per Unit | 3 |
| Voltage Per Unit | 6 V |
| Capacity | 4.5 Ah @ 20hr-rate to 1.75V per cell @ 25°C (77°F) |
| Weight (kg) | Approx. 0.84kg. (1.85 lbs.) |
| Maximum Discharge current (A) | 60A/90A (5sec.) |
| Internal Resistance Approx. | Approx. 18.5 mΩ |
| Operating Temperature Range | Discharge：-15℃~50℃(5°F~122°F) Charge：-15℃~40℃(5°F~104°F) Storage：-15℃~40℃(5°F~104°F) |
| Nominal Operating Temperature Range | 25°C ± 3°C (77°F ± 5°F) |
| Float charging voltage | 6.75 to 6.9 VDC/unit Average at 25℃ (77°F ) |
| Recommended Maximum Charging current limit | 1.35A |
| Equalization and Cycle Service | 7.2 to 7.5 VDC/unit Average at 25℃ (77°F ) |
| Self Discharge | It should be more than 75% of the capacity that before storage after stocked for 6 months at ambient temp. 25℃ |
| Terminal | F1/F2-Faston Tab187/250 |
| Container Material | ABS(UL94-HB) & Flammability resistance of(UL94-V0) can be available upon request. |