New 12V Lead-Acid Scooter Battery - Internal Resistance
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SLA / AGM / Gel battery (12V, 7–12Ah typical for scooters)
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Internal Resistance: ~20–50 milliohms (0.02–0.05 Ω) per cell
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Total battery (6 cells in series, 12V nominal): ~0.12–0.3 Ω
Notes:
- Lower internal resistance = better ability to deliver high current (important for starting scooters).
- Resistance increases with battery age, sulfation, or poor charge.
- Measurement: typically done with a micro-ohmmeter or a battery internal resistance tester at low current (~1–5A).
Normal 18650 Battery Internal Resistance
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Typical Nominal Voltage: 3.6–3.7V
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Capacity: 2000–3500 mAh
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Internal Resistance (Fresh, New):
- Standard Li-ion (e.g., Panasonic NCR, LG, Samsung): ~30–80 milliohms (0.03–0.08 Ω)
- High-drain Li-ion (e.g., for power tools, e-cigarettes): ~15–30 milliohms (0.015–0.03 Ω)
Notes:
- Lower internal resistance → higher possible discharge current
- Internal resistance increases with:
- Battery aging
- High temperature or deep cycling
- Poor storage conditions
- Measured at room temperature (~20–25°C) and at low AC or DC test current
⚡ Summary:
A healthy new 18650 battery typically has 0.03–0.08 Ω internal resistance, with high-drain versions as low as 0.015–0.03 Ω.