You don’t need a battery tester to figure out whether that loose AA in the junk drawer still has enough life to matter. This quick at-home battery check helps you sort the keepers from the duds in seconds, which is a lot better than playing remote-control roulette again. And yes, the random countertop battery finally has a moment of truth.
We all have batteries lying around the house, sometimes they appear in random places, on a countertop, under a couch cushion, or in a kitchen junk drawer (surely there's SOME life left to it, right? I mean, why else would someone have thrown it in there??). Here is a simple test that you can do yourself to test if your battery still has some life left to it . . .
A basic battery tester costs more than this method, because this one costs nothing if you already have a flat surface and the battery in question. It also lets you check common household sizes one at a time without buying another gadget you’ll toss in the same drawer as the mystery batteries.
You’ll need just 1 item for the main test: the battery you want to check. This works on A, AA, AAA, C, and D batteries, and you’ll only need a solid flat surface to drop it on. If you’re checking 9-volt batteries, the original method also includes a separate quick check for those.
- 🧰 Materials You'll Need
- 🔧 Tools/Equipment
- 🛠️ How to Test a Battery Without a Tester
- 🛠️ How to Read the Results
- 🛡️ Battery Safety and Disposal
- 💸 Cost Breakdown
- ❓ Frequently Asked Questions about How to Test Batteries at Home
- 📌 Love this How to Test Batteries at Home? Pin it!
- 🖨️ Print-Friendly How-To: How to Test Batteries at Home
We all have batteries lying around the house, sometimes they appear in random places, on a countertop, under a couch cushion, or in a kitchen junk drawer (surely there’s SOME life left to it, right? I mean, why else would someone have thrown it in there??).
Materials You’ll Need
- 1 battery to test
- For the main drop test: A, AA, AAA, C, or D battery
- Optional for disposal: a small piece of tape for each end of a discarded battery
- Optional for 9-volt disposal: electrical tape over the positive and negative posts
Tools/Equipment
- Solid flat surface
How to Test a Battery Without a Tester
- Stand the battery up on the negative end, which is the flat end.
- Pick it up about 3/4 of an inch off a solid flat surface.
- Drop it and watch how it lands.
How to Read the Results
If it lands with a small thud back on the flat end and stays in place, the battery still has a charge.
If it bounces and then falls over, the battery is dead.
Still unsure of what it’s supposed to look like? Here’s a video that will show you:
(Please note, the Dead battery in the video did have a “charge” of .71 (less than the amount needed to power a mini flashlight and was indeed, dead.)
This works on the following size batteries: A, AA, AAA, C, D.
Battery Safety and Disposal
When discarding a battery, place a small piece of tape over each end to help prevent possible fire.
9 Volt batteries can be tested by wetting your finger and laying it across the top of both posts (positive and negative) if you get a Tingle- it’s LIVE. If you don’t feel anything, it’s dead. Please note, the “Tingle” can be pretty strong and shouldn’t be attempted by those with heart conditions or pacemakers. (That’s my disclaimer right there!)
Never store a 9 volt battery in a junk drawer where it can come into contact with a metal object such as a paper clip, steel wool, etc as this can cause items to ignite and create a fire in your home.
If you don’t believe me, put a 9 volt battery in your pants pocket with some loose change and you’ll feel the heat in short order… we could even call you Hot Pants! Always dispose of batteries by placing electrical tape over the tops of the positive and negative posts.
Loose batteries can short against metal objects during storage or transport, which is why covering contacts with tape is a smart habit. Energizer’s battery care guidance recommends placing insulated tape across battery contacts or storing loose batteries so they can’t touch metal items like coins or keys: battery care and storage guidance here.
Cost Breakdown
This test uses items you already have on hand, so the out-of-pocket cost for checking one battery is effectively $0.00. If you need tape for disposal, that cost is only pennies per battery.
Frequently Asked Questions about How to Test Batteries at Home
Yes. The original method says this works on A, AA, AAA, C, and D batteries. Stand the battery on its flat negative end, lift it about 3/4 inch, and drop it onto a solid flat surface.
In this method, a battery that bounces and then falls over is considered dead. A battery that lands with a small thud and stays standing still has some charge left.
Lift it about 3/4 of an inch above a solid flat surface. You don’t need to drop it from any higher than that to use this method.
Not the drop test. The original article gives a different 9-volt check: wet your finger and touch it across both posts. If you feel a tingle, it’s live. If not, it’s dead. Because that tingle can be strong, it shouldn’t be attempted by anyone with a heart condition or pacemaker.
Taping the ends helps prevent the terminals from contacting metal or other batteries, which can create heat or a fire risk. It’s a simple extra step, especially for loose batteries heading to the trash or recycling container.
No, that’s one battery you don’t want rolling around with paper clips, steel wool, or loose change. Contact with metal can create enough heat to cause trouble fast.
No. This method only tells you whether the battery still has some charge left. It does not measure exact remaining power or guarantee the battery will run every device well.
Use a solid flat surface. That’s the surface described in the original directions, and it gives you the clearest result when the battery lands.
No special equipment is needed for the main test. That’s the whole appeal here: one battery, one flat surface, and a split second to see whether it’s worth keeping.
📌 Love this How to Test Batteries at Home? Pin it!
Did you try this quick test? Tell us whether your junk-drawer batteries passed, failed, or surprised you.
🖨️ Print-Friendly How-To: How to Test Batteries at Home
How to Test Batteries at Home
Equipment
Materials
- 1 battery to test
- Small piece of tape for each end of a discarded battery
- Electrical tape for the tops of positive and negative posts on a discarded 9-volt battery
Instructions
- Stand the battery up on the negative end, which is the flat end.
- Pick it up about 3/4 of an inch off a solid flat surface.
- Drop it and watch how it lands.
- If it lands with a small thud back on the flat end and stays in place, the battery still has a charge.
- If it bounces and then falls over, the battery is dead.
- Wet your finger and lay it across the top of both posts on the 9-volt battery.
- If you get a tingle, it's live.
- If you don't feel anything, it's dead.
- This works on the following size batteries: A, AA, AAA, C, D.
- The dead battery in the video did have a charge of .71, which was less than the amount needed to power a mini flashlight and was indeed dead.
- When discarding a battery, place a small piece of tape over each end to help prevent possible fire.
- The 9-volt tingle can be pretty strong and shouldn't be attempted by those with heart conditions or pacemakers.
- Never store a 9-volt battery in a junk drawer where it can come into contact with metal objects such as paper clips, steel wool, or loose change, as this can create a fire risk.
good to know about the tape when disposing of those….i didn’t know about the fire hazard. thanks for the information.
this was very helpful to know. :stars:
wow, i never thought about the fire hazard, will be taping all batteries, good info ! thank you
Good information…..thanks so much for posting.
Good to know. I seem to keep dead batteries cuz I don’t know which are good or bad
Fresh, yes. Dead? Not so much.
Researchers at Princeton University have found that the common test of bouncing a household battery to learn if it is dead or not is not actually an effective way to check a battery’s charge.
“The bounce does not tell you whether the battery is dead or not, it just tells you whether the battery is fresh,” said Daniel Steingart, an assistant professor of mechanical and aerospace engineering and the Andlinger Center for Energy and the Environment.