Prius Starter Battery

Starter Battery

• Toyota Part Number: 28800-21171
• Battery Type: AGM (Absorbant Glass Mat), sealed, maintenance-free, vented
• Voltage: 12v
• Capacity: 45 Ah (20-hour rate)
  • can deliver 2.25 amps continuously for 20 hours (2.25 A × 20 h ≈ 45 Ah)
  • before reaching cutoff voltage 10.5v
• lead-acid battery
• Reserve Capacity: 66 minutes

Troubleshooting

• “Dead” battery (say, ~11.3 V), it might still have ~10–15
• So instead of 45 Ah needed to charge, its 30Ah

Hybrid battery (200 volts)

• Spins ("cranks") the engine via motor generator, MG1