# SW640 (6V 4.0AH) Lead Acid Battery

## Specifications
️· Nominal Voltage: 6V
️· Rated Capacity (20hr): 4.0 Ah
️· Dimensions: 70mm (L) x 47mm (W) x 106mm (H)
️· Weight: 0.72 Kg (1.59 lbs)
️· Internal Resistance: 30 mΩ (at full charge, 25°C)
️· Terminal Type: T1

## Performance Characteristics
️· Capacity at Different Discharge Rates (25°C):
- 20hr (0.20A): 4.00 Ah
- 10hr (0.37A): 3.70 Ah
- 5hr (0.68A): 3.40 Ah
- 1hr (2.40A): 2.40 Ah
️· Capacity Affected by Temperature (20hr rate):
- 40°C (104°F): 102%
- 25°C (77°F): 100%
- 0°C (32°F): 85%

- -15°C (5°F): 65%
️· Self-Discharge (at 25°C):
- After 3 months: 91%
- After 6 months: 82%
- After 12 months: 64%

## Charging Instructions
️· Cycle Charging:
- Initial Current: Less than 1.6A
- Voltage: 7.20-7.35V
️· Float Charging:
- Voltage: 6.75-6.90V