# How to tell if a (chargeable or not) battery is bad?

• swampwiz
In summary, the conversation discusses the difficulty of determining if a battery is bad without testing it in a device, and the factors that contribute to a battery's ability to deliver current. The use of a digital multimeter is mentioned, and the motivation for the question is explained as needing to use rechargeable batteries for a digital camera. The suggestion is made to use resistors to match loads for different gadgets and measure the voltage drop to determine if a battery is bad.
swampwiz
Somehow I've never really known how to tell if a battery is bad without simply using it and seeing if the device it is powering doesn't work, an experiment that can get tricky trying to isolate a singe battery in a device that uses multiple battery cells. I figure that it is some combination of voltage and internal impedance - i.e., which is an effect of the ability of a battery to deliver a current, which is why in that "The Mechanical Universe" episode, a lemon can be made into a "battery" that can generate a voltage but not much current.

I have a pretty good digital multimeter. The motivation for this question is that I'm trying to take pictures with a digital camera (i.e., a real camera, not a smartphone) that requires rechargeable batteries, but all my batteries like that don't seem to work (I'm charging them as I type.)

Find resistors that match loads for the various gadgets, measure voltage(s) across just the battery, and then across the battery plus the "dummy load." Excessive drop is a bad battery.

## 1. What are the signs that a battery is going bad?

Some common signs that a battery is going bad include decreased battery life, difficulty holding a charge, and visible physical damage such as leakage or bulging.

## 2. How can I test if a battery is bad?

There are a few methods for testing a battery's health, including using a multimeter to check the voltage, performing a load test to see how the battery performs under a heavy load, and using a battery analyzer tool.

## 3. What is the average lifespan of a battery?

The average lifespan of a battery can vary depending on the type, usage, and quality of the battery. Generally, rechargeable batteries can last anywhere from 2-7 years, while non-rechargeable batteries may last 3-10 years.

## 4. Can a bad battery be repaired?

In most cases, a bad battery cannot be repaired. However, it is possible to extend the life of a battery by properly maintaining and caring for it, such as avoiding extreme temperatures and fully charging and discharging it regularly.

## 5. How can I dispose of a bad battery?

It is important to properly dispose of a bad battery as they contain harmful chemicals. Many cities have designated drop-off locations for battery recycling. You can also check with your local waste management company for proper disposal methods.

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