Just by looking at the battery physically, you can't identify the renaming battery capacity of it. This can be a problem if the electronic device you are trying to power on doesn't work. You could buy a battery tester tool to check the battery level accurately. Or you could just make your own home made battery tester using a light bulb for dirt cheap. You use a light bulb that is rated at the same voltage as your battery you want to test. For example, if the battery you want to test is rated at 9 volts, you use a 9 volt bulb.
1) You will need a light bulb that is rated at the same voltage as the battery you want to test. Once you have got that, you will need a holder to fit your light bulb in. This will make it straightforward to make connections with the metal contacts at the bottom.
2) Insert the glass bulb into the battery holder. Line up the bottom metal part with the hole in the middle. Then screw the blub anticlockwise to secure it in place.
3) Obtain two pieces of wire that is the same length. Unscrew both screws half way on the bulb holder using a Flat head. Wrap the wires braid around each screw and tighten them both back up securely.
4) Place the red wire onto the positive battery terminal and the black wire onto the negative battery terminal. If the filament lights up really bright, it shows you that the battery is fully charged. If the filament lights up really dull or doesn't light up at all, it is a good indication that the battery is dead and needs replacing.
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