When we rely on batteries to meet our power needs, understanding battery lifespan is crucial. So, how long will a 20Ah battery last? Let’s explore this topic.
Calculating Battery Lifespan
In theory, we can use the following formula to calculate battery discharge time:
Battery Lifespan (hours)=Load Current (A)Battery Capacity (Ah)
- Battery Capacity (Ah): This value is typically printed on the battery. For example, AA batteries have a capacity of 2.5Ah or 2500mAh, AAA batteries have a capacity of 1Ah, laptop batteries range from 2Ah to 6Ah, and a 100Ah battery has a capacity of 100Ah.
- Load Current or Current Consumption (A): This is a tricky factor and contributes to the difficulty in calculating battery lifespan. Load current depends on the power of the device connected to the battery. For instance, the load current for a 1000W air conditioner will be ten times greater than that of a 100W personal evaporative cooler.
Lifespan of a 20Ah Battery
Now, let’s answer your question: If a 20Ah battery is continuously used with a 1-ampere current, it can theoretically last approximately 20 hours before needing a recharge. This calculation assumes that you consume 1 ampere of current from the 20Ah capacity every hour.
