The Universal Battery Charger Selector calculates the recommended charger current based on battery capacity and selected C-rate.
This ensures safe charging, improved battery health and prevents overheating or overloading small batteries.
How Charger Current Is Calculated
Charging current is based on battery capacity multiplied by the selected C-rate. Lower C-rates charge slower
but improve longevity, while high C-rates provide fast charging but generate more heat.
Formula:
Charge Current (A) = Capacity (Ah) × C-Rate
Why Correct Charger Size Matters
- Avoids battery overheating
- Improves cell longevity
- Prevents BMS stress
- Ensures safe and balanced charging
Works With Many Battery Types
- LiFePO₄
- Lithium-ion
- NMC / NCA
- Lead-acid (AGM / Gel)
- Custom battery packs
Frequently Asked Questions
Q: What is a safe charging C-rate?
Most lithium batteries are safely charged between 0.2C and 0.5C depending on temperature and BMS limits.
Q: Can I charge faster than 0.5C?
Only if your battery manufacturer specifies a fast charge C-rate and supports increased thermal monitoring.
Q: Does this work with LiFePO₄?
Yes, LiFePO₄ is commonly charged at 0.2C for long cell life and minimal heat.
Q: What if my charger current is higher than recommended?
Overcharging shortens battery life, increases heat and may cause BMS shutdown or reduced cycle count.
Q: Does higher voltage require a different charger?
Yes. Chargers must match battery voltage—never use a charger with a different voltage.
