You can test a battery by using multimeter. Set the multimeter to the DC voltmeter setting and then place the leads of the multimeter across the leads of the battery. the multimeter will have a readout of the voltage.
a test battery is what you need to work out your capasity analysis after.
Take the battery out and test it with a multimeter.
to see how strong your battery is
You can take it to a battery place and they can test it under a load.
You can test your battery with a battery tester. If you don't have a battery tester, you could take the battery to Advance Auto Parts and they will test it for you for free.
13 test batteries
Battery load test
A battery charger can be used to test a battery if the charger includes a voltmeter, so you can read off the voltage. Note: A battery charger is designed to be used only for rechargeable batteries. It can be very dangerous to try to use a battery charger to test or recharge normal non-rechargeable batteries.
give me kinds of battery...
Have a shop load test the battery.
Battery capacity tester
Put the red test lead on the positive and the black test lead on the negative post of the battery and see the result.