Makita’s PA14 (7.2V), 1420 (9.6V), and 1422 (12V) Ni-Mh packs power millions of legacy tools. But Ni-Mh suffers from memory effect, high self-discharge (30%/month), and weight penalty. AussieBatt Li-ion replacements solve all three issues while adding 40-60% runtime.
Chemistry Conversion: What Changes?
Original PA14 Ni-Mh: 7.2V, 2.0Ah, 380g AussieBatt Li-ion PA14-R: 7.4V, 3.0Ah, 190g.
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Energy density: 55Wh/kg → 118Wh/kg
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Self-discharge: <3% monthly
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No memory effect
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Compatible with original Makita DC1804 charger (auto-detects voltage)
Battaussie integrated BMS (Seiko S8254 chip) handles both Ni-Mh and Li-ion algorithms:
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Ni-Mh Mode: -dV/dt termination at 0°C-40°C
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Li-ion Mode: CC-CV at 4.2V/cell cut-off
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Hybrid Mode: Gradual voltage ramp for legacy chargers (prevents BMS lockout)
Cycle Life Optimization Tips
From our 500-cycle lab test on PA14-R:
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Optimal charge voltage: 4.15V/cell (extends life 22%)
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Storage charge: 40% SoC for >3 months idle
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Temperature sweet spot: 15-25°C operation
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Avoid discharging below 3.0V/cell (triggers BMS lock)
For repair centers: Our PA14-R uses 2x LG HG2 18650 cells. Replacement procedure:
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Discharge Makita 1420 tool battery pack to 6.0V total
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Remove 4 Phillips screws
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De-solder BMS (note thermistor wire positions)
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Spot-weld new cells with 0.15mm nickel strip
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Apply Kapton tape insulation
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Cycle 3x to calibrate fuel gauge
Safety & Compliance Notice
⚠️ UN38.3 Transport: Li-ion packs classified as UN3480. Do not check in aircraft cargo without proper labeling. Store below 25°C. Do not puncture or incinerate. Contains overcharge protection; do NOT use automotive 12V chargers.
Q: Will Li-ion PA14 battery damage my old Makita 6012HD cordless drill? A: No. Voltage difference (7.2V vs 7.4V) is within 3% tolerance. Motor draw remains safe. We’ve tested 50+ legacy tools zero failures.
Q: Can I use my Ni-Mh charger? A: Yes, but charge time increases 30%. For optimal speed, upgrade to our ABC-MK dual-chemistry charger.