#1
EastyGold YJS00219EastyGold Digital Battery Capacity Tester
Voltmeter display for rechargeable lithium cells.
- Display type
- LCD
- Battery types supported
- —
- Weight
- 1.8 oz
Household Battery Testers · 6 compared side by side
Best Battery Testers in 2027
A drawer full of loose AA, AAA and button batteries is only useful if you know which ones still work. A household battery tester tells you in seconds, so you stop throwing out good batteries and stop putting dead ones back into remotes, toys and smoke alarms. The best testers apply a small load while measuring, which gives a truer picture than voltage alone, and show the exact voltage as well as a good, weak or poor reading. Check which sizes each tester supports, including 9V, CR123A and button cells. We put 6 battery testers on one spec sheet so you can compare them side by side.
Quick answer
- Best overall: EastyGold YJS00219 (#1, Best Score 61; display type LCD)
- Simplest bar display: DLYFULL B2 (#3, Best Score 67; display type LCD)
Ranked from 6 household battery testers that met our standard, compared on load testing, exact voltage readout, supported battery types (AA/AAA/C/D/9V/button cell).
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Top picks
#2
TEKCOPLUS BCTK-64TEKCOPLUS BCTK-64 LCD Battery Tester
- Display type
- LCD
- Battery types supported
- 7
- Weight
- 0.3 oz
#3
DLYFULL B2Dlyfull B2 Battery Tester
Good, weak or poor bars with a 1.5-year warranty.
- Display type
- LCD
- Battery types supported
- —
- Weight
- 4.1 oz
Comparison table
Swipe or scroll sideways to see every model.| Spec | ||||||
|---|---|---|---|---|---|---|
| Best Scoreout of 100 | 61 | 57 | 67 | 52 | 59 | 57 |
| Display type | LCD | LCD | LCD | LCD | LCD | LCD |
| Real-load testing | — | — | — | — | — | — |
| Shows exact voltage | Yes (best in row) | — | No | No | No | Yes (best in row) |
| Tests 1.2V rechargeables | — | — | No | No | No | No |
| Tests button cells | Yes | Yes | Yes | Yes | Yes | Yes |
| Tests CR123A/CR2 lithium | — | — | Yes | Yes | Yes | — |
| Battery types supported | — | 7 | — | — | — | — |
| Needs own battery | — | No (best in row) | Yes | Yes | Yes | No (best in row) |
| Max test voltageV | 9.0 V | — | — | — | — | — |
| Weightoz | 1.8 oz | 0.3 oz (best in row) | 4.1 oz | 0.3 oz (best in row) | 0.3 oz (best in row) | 1.4 oz |
| Lengthin | 4.3 in (best in row) | 5.8 in | 5.2 in | — | — | — |
| Testers in pack | 1 | 1 | 1 | 1 | 1 | 1 |
| Warrantyyears | — | — | 1.5 years | 1.5 years | 1.5 years | — |
Best in row— not published by the maker yet
How we chose
We reviewed 20 household battery testers and kept only the 6 that pass every check below. Those are ranked by a Best Score built from spec fit for this job, sales rank.
- 4.0★ or higherAverage customer rating
- Proven demand25+ reviews or an Amazon sales rank
- In stockAvailable to order when checked
- 50%+ specs knownEnough data to compare fairly
In-depth reviews
These reviews are based on each tester's published specifications and listing information, in the order of our ranking.
Best for 18650 lithium cells
EastyGold YJS00219EastyGold Digital Battery Capacity Tester
EastyGold tester adds 18650 lithium cells
- Battery types supported
- —
- Weight
- 1.8 oz (best of the reviewed tools)
- Warranty
- —
- Display type
- LCD (best of the reviewed tools)
The EastyGold YJS00219 ranks third. It is a digital capacity tester that covers the usual AA, AAA, C, D and 9V batteries plus mini button cells, and it adds rechargeable lithium cells such as 18650, 16340, 14500 and 10440, which are used in flashlights, vapes and power tools.
It has a voltmeter-style interface that shows the voltage value clearly, measuring both 1.5V and 9V batteries. You place the battery between two contact points and the display tells you its current status right away, with no buttons to press.
It is compact at about 4.33 by 2.36 in, so it fits easily in a drawer or tool bag. Real-load testing is not listed in our data, so treat borderline readings with some care. For flashlight users and hobbyists who keep 18650 cells alongside household batteries, it is the most useful tester here. Check a lithium cell's voltage before charging it, and recycle any that read very low.
Pros
- Tests 18650 and other lithium cells
- Shows exact voltage
- Compact
Cons
- No load testing listed
- Warranty not listed
- Buy it if
- you use 18650 or similar lithium cells.
- Skip it if
- you only check AA and AAA.
VerdictThe best pick here for lithium cells.
Simplest bar display
DLYFULL B2Dlyfull B2 Battery Tester
Dlyfull B2, a simple tester with clear bars
- Battery types supported
- —
- Weight
- 4.1 oz
- Warranty
- 1.5 years
- Display type
- LCD (best of the reviewed tools)
Fourth in our ranking, the Dlyfull B2 keeps things simple. Its LCD shows battery health with bars that read poor, weak or good, so anyone in the house can check a battery without understanding voltages. Our data notes it does not show the exact voltage.
It tests AA, AAA, C, D, 9V and N cylindrical batteries, CR123A, CR2, CRV3, 2CR5 and CR-P2 lithium batteries, and a wide variety of button cells. It is not listed for 1.2V rechargeables, so NiMH batteries may read low.
Dlyfull calls it one of the smallest and lightest portable battery checkers, with a compact body and an anti-slip finish for a firm grip. It needs its own power and carries a 1.5-year warranty, tied for the longest on this page. For families who want a quick yes or no on disposable batteries, it is an easy choice.
Pros
- Simple good, weak, poor bars
- Many lithium and button sizes
- 1.5-year warranty
Cons
- No exact voltage
- Not for 1.2V rechargeables
- Buy it if
- you want an easy reading for disposable batteries.
- Skip it if
- you use NiMH rechargeables.
VerdictThe simplest digital tester in our top five.
Best among the reviewed tools
Buying guide
Load testing
Testers that apply a small load show how a battery performs in use. Voltage alone can make a weak battery look good.
Display type
LCD testers can show exact voltage and a status bar. Analog needle testers are simple and often need no battery of their own.
Battery sizes
Check support for the sizes you use: AA, AAA, C, D, 9V, button cells and CR123A. Testers here list from 6 to 14 types.
Rechargeables
NiMH rechargeables run at 1.2V. Choose a tester that supports them, or they may read as weak when they are full.
FAQ
Are battery testers accurate?
Load-testing models are more reliable than plain voltage checkers. All give a good guide to whether a battery is worth keeping.
Can a battery tester test rechargeable batteries?
Many can, but check for 1.2V NiMH support. Without it, a full rechargeable may show as weak.
What voltage means a AA battery is dead?
A fresh alkaline AA reads about 1.5V. Below about 1.2V under load, most devices will struggle.
Can I test batteries with a multimeter instead?
Yes, a multimeter shows voltage, but it does not apply a load, so a dedicated tester gives a better health reading.
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