How to Get Accurate RC Battery IR Readings
Tired of seeing Internal Resistance (IR) numbers jump all over the place? Accurate IR is the secret to knowing exactly how much “punch” your battery has left. If your readings aren’t consistent, you’re just guessing.
At RC Discharger, we want you to have the most precise data possible. Here is how you dial in your setup for professional-grade consistency.
1. Check Your Connections!
The #1 cause of inconsistent IR is a weak physical connection. A loose 5mm bullet on your charge cable is a resistance killer.
Pro Success Story: Team driver Ronnie Vasquez solved his IR fluctuations by simply tightening his connectors and slightly lowering his amperage. It’s the small details that win races!
2. Use the Right Cable Gauge
Heat is the enemy of accuracy. Pushing high current through thin wire is dangerous and yields bad data. Follow these minimums:
- Up to 30A: Use at least 12AWG cable.
- Up to 45A: Use at least 10AWG cable.
- Up to 70A: Use at least 8AWG cable.
3. Respect Your Battery Size
Over-cycling a battery with too much amperage will cause cell imbalance and sky-high IR readings. Match your discharge to your pack height:
- Low-Profile Batteries: Max 30A.
- Standard (25mm) Batteries: Max 45A.
Safety First: Monitor Your Temps
To protect your investment and ensure accuracy, never let your packs exceed 45°C (113°F). We highly recommend using our dedicated temperature sensor to auto-monitor your battery during high-current cycles.
Grab your sensor here: iCharger Temperature Sensor for LiPo Battery | RC Discharger