how many hours would a AA battery last with someone pulling 180mA@5V
The capacity of an AA battery typically ranges from 1800mAh to 3000mAh, depending on the brand and type.

To calculate how many hours a AA battery would last with someone pulling 180mA@5V, we need to convert the power to watts by multiplying current (I) by voltage (V):

P = I * V = 0.18A * 5V = 0.9W

Then, we can estimate the battery life by dividing the battery capacity by the power consumption:

t = C / P

If we use a 2000mAh battery, for example, the estimated battery life would be:

t = 2000mAh / 0.9W = 2222.22 hours

However, this is just an estimate, and the actual battery life can vary depending on factors such as temperature, discharge rate, and the age of the battery.
How many days is that?
2222.2 hours is 92.59 days.

However the answer I gave above was incorrect, this is the correct solution:


Assuming the AA battery has a capacity of 2000mAh, and the load current is 180mA at 5V, we can calculate the battery life as follows:

First, we need to convert the load voltage to the battery voltage. Assuming the AA battery voltage is around 1.5V, we can calculate the load current as follows:

Load current = Load voltage / Battery voltage = 5V / 1.5V = 3.33A

Next, we can calculate the battery life using the following formula:

Battery life (in hours) = Battery capacity (in mAh) / Load current (in mA)

So, the battery life would be:

Battery life = 2000mAh / 180mA = 11.1 hours 

Therefore, the AA battery would last approximately 11.1 hours(or 0.46 days ie  approx. half a day) with a load of 180mA at 5V.