These markings may be on the top or just to the side of the compartment door.
You might also see a clasp or a lever that will release the compartment door. The battery compartment may also be held shut by one or more small screws.
If you’re looking online, make sure to include the brand name and model number, if you know it.
If the screw is stuck, you may be able to remove it using a screw extractor. In the case of a watch battery, you may need to use a special tool to remove the back of the watch.
AAA, AA, C, and D batteries are all 1. 5V batteries, but the different sizes produce different currents, or the amount of power that comes out of the battery at once. AAA is the smallest traditional 1. 5V battery, and is usually used to power small electronics. D is the largest 1. 5V battery and usually charges larger items like flashlights. A 9V battery looks like a small box with snaps on top, and it’s often used to power devices like smoke detectors and walkie-talkies. [2] X Research source Coin and button batteries are small and round, and they’re used to power very small devices like watches, hearing aids, and computer components. [3] X Trustworthy Source United States Environmental Protection Agency Independent U. S. government agency responsible for promoting safe environmental practices Go to source
The negative end of the battery should be flat, and it may or may not be marked with a minus, or -, symbol.
If the polarity isn’t marked on your device, you may need to consult the manufacturer’s instructions.
The plus sign on the battery should match the plus sign on the device.
The positive end of the battery should snap into place with a gentle push.
Some devices that use multiple batteries may continue to function if one battery is installed incorrectly, but you can damage the device or shorten the life of the batteries by doing so.
It will be very obvious if you try to put in a 9V battery incorrectly, as the connectors will bump against each other and the battery won’t snap into place.
These types of batteries can be a little hard to install sometimes. If it doesn’t go in the first time, try again with a little more force.
Usually only the positive side of the battery is etched. The negative side might not have any markings at all. In some button-style batteries, the positive side is slightly raised.
In the case of devices with a battery door, such as a hearing aid, you may find it difficult to close the compartment if you put the battery in backward.
If you’re installing a coin cell battery on a computer’s motherboard, for instance, there may not be any markings to indicate which way the battery should go, but the positive side should face upward. If you’re still not sure, consult the device’s user manual.
