How long does it take to charge a 7.2 volt battery using charger?

The charging time for a 7.2-volt battery using a charger depends on several factors, including the battery capacity in ampere-hours (Ah), the charging current in amps (A), and the charger's efficiency. Here's a general formula to estimate the charging time:

Charging Time (in hours) = (Battery Capacity in Ah) / (Charging Current in A) / (Charger Efficiency)

Let's assume the following values for our calculation:

Battery Capacity: 7.2-volt, 2000 mAh (2 Ah)

Charging Current: 1 Amp (A)

Charger Efficiency: 80% (0.8)

Plugging these values into the formula:

Charging Time = (2 Ah) / (1 A) / (0.8)

Charging Time ≈ 2.5 hours

Therefore, it would take approximately 2.5 hours to charge a 7.2-volt, 2000 mAh battery using a 1-amp charger with an 80% efficiency.

It's important to note that this calculation provides an approximate estimate, and the actual charging time may vary depending on the specific battery and charger used. Additionally, some chargers may have built-in smart charging algorithms that adjust the charging current and voltage based on the battery's condition, which can affect the charging time. Always refer to the manufacturer's specifications and recommendations for the specific battery and charger you are using.