Best Charger for the 120Ah cMAX PRO Car Audio Battery Module
The 120Ah cMAX PRO 14.8 V Plug-&-Play Car Audio Battery Module from JAG35 is a high-performance lithium-based battery designed for demanding car audio systems. To get the most out of it — and to ensure long-term safety and performance — it’s important to use a charger that matches its voltage and chemistry.
🔋 Battery Overview
- Configuration: 4s5p (14.8 V nominal) — 4 cells in series, 5 in parallel.
- Chemistry: Lithium (NMC / Lithium-Ion), not lead-acid — requires a compatible charge profile.
- Ideal for: High-wattage car audio systems up to 20,000 W.
⚡ Recommended Charging Parameters
For a 4-cell lithium configuration, the correct voltage range and charging behavior are essential to maintain balance and lifespan. Based on manufacturer recommendations and field-tested setups from experienced users:
- Charging Voltage: 14.4 V – 14.8 V (3.6 – 3.7 V per cell)
- Maximum Charge Voltage: Do not exceed 15 V
- Recommended Charging Current: 0.5C – 1C (≈ 60 A – 120 A for a 120 Ah pack)
- Absorption Cutoff Current: Around 5 % of capacity (≈ 6 A)
✅ What Type of Charger to Use
Choose a high-quality charger or power supply designed for lithium batteries that allows precise voltage control. Below are the features you should look for:
- Adjustable output voltage (set between 14.4 V – 14.8 V)
- High current output (50 A – 120 A recommended)
- Multi-stage charging (bulk → absorption → float or pulse maintenance)
- Built-in temperature protection and voltage regulation
- Low ripple DC output for audio system stability
- Optional temperature sensor or compensation feature
A charger rated around 14.8 V at 60 A is a solid choice for most setups. If possible, use a smart charger that can taper current once the target voltage is reached to prevent overcharging.
⚠️ Important Safety Notes
- Never charge above 15 V — this can trigger BMS protection or damage the pack.
- Ensure proper ventilation and avoid charging near high temperatures.
- Monitor cell balance periodically or use a built-in balancer if available.
- If the battery becomes hot during charging, stop and allow it to cool before resuming.
- For vehicle charging, verify your alternator can maintain a stable 14.4 – 14.8 V output under load.
📋 Quick Reference Table
| Parameter | Suggested Value |
|---|---|
| Nominal Voltage | 14.8 V |
| Full Charge Voltage | 14.6 – 14.8 V |
| Maximum Safe Voltage | 15 V |
| Recommended Charge Current | 60 A – 120 A (0.5C – 1C) |
| Absorption Cutoff Current | ≈ 6 A |
| Charger Type | Adjustable multi-stage lithium charger |
💡 Summary
To safely and effectively charge your 120Ah cMAX PRO 14.8 V Battery Module, use a lithium-compatible charger that can output between 14.4 V and 14.8 V and supply between 50 A and 120 A of current. Avoid exceeding 15 V to protect the cells and BMS. Using a smart, temperature-protected charger will ensure optimal performance, long service life, and consistent power delivery for your car audio system.