For fast charging, what is the maximum rate for a NiCad or Ni-MH battery as a percentage of its ampere hour rating?

The maximum rate for fast charging a NiCad or Ni-MH battery is commonly set at approximately 10% of its ampere-hour (Ah) rating. This means that if a battery has a capacity of, say, 2000 mAh, a fast charge would ideally be applied at around 200 mA. This percentage is part of the general guidelines to ensure the longevity and safety of the battery during the charging process.

Charging at or above this rate can lead to overheating, reduced battery life, and potential damage if not properly managed. This is particularly important for NiCad and Ni-MH batteries, as they are more sensitive to charging conditions compared to other battery chemistries. Consequently, fast charging is usually employed within these recommended limits to maintain performance while ensuring safety.