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Tenergy T-333 is the better pick for cell checkers because it covers the widest range — AA, AAA, C, D, 9V, CR123A, CR2, CRV3, 2CR5, CRP2 and button cells — while DLYFULL suits anyone wanting instant poor/weak/good bars on AA, AAA, C, D, 9V, N, CR123A, CR2, CRV3, 2CR5, CRP2 and button cells, and La Crosse suits rechargeable users with its 1.2V setting. The Tenergy weighs 0.01 ounces versus 0.32 ounces for the DLYFULL and 1.13 ounces for the La Crosse, and only the La Crosse offers separate 1.5V, 1.2V and 3.0V settings.
- Choose Tenergy T-333 if you test camera and specialty cells — it reads CR123A, CR2, CRV3, 2CR5 and CRP2 alongside standard sizes.
- Choose DLYFULL if you want an instant readout without interpreting numbers — its LCD bars show poor, weak or good on AA, AAA, C, D, 9V and N.
- Choose La Crosse if you run rechargeable batteries — it is the only one here with a dedicated 1.2V setting next to its 1.5V and 3.0V ranges.
I compared these three on cell coverage, voltage settings and display type, working only from the listed specifications. Rechargeable support, specialty battery support and how each readout is presented were the deciding factors.
🏆 Quick Picks — My Top Recommendations
Best Overall: Tenergy T-333 Universal Battery Tester
Tests the widest range including CR123A, CRV3, and button cells with 5,335 ratings — Check Price →
Runner-Up: DLYFULL Universal Battery Checker
Includes 1x AAA battery and an 18-month warranty with crisp LCD status bars — Check Price →
Best for Rechargeables: La Crosse 911-65557-INT Digital Tester
Only tester here that checks both rechargeable and alkaline with 1.2V, 1.5V, and 3V settings — Check Price →
I put the three testers side by side in this table so you can see exactly where they split on battery types, weight, and rechargeable support.
Full Specs Comparison
| Specification | Tenergy T-333 Universal B | DLYFULL Battery Tester fo | La Crosse 911-65557-INT P |
|---|---|---|---|
| Brand | Tenergy | DLYFULL | La Crosse Technology |
| Model Number | T-333 | — | ✅ 911-65557-INT |
| Power Source | Battery Powered | Battery Powered | Battery Powered |
| Display Type | LCD | LCD | Digital |
| Color | Black | Red | Black |
| Item Weight | 0.01 ounces | 0.32 ounces | ✅ 1.13 ounces |
| Product Dimensions | ✅ 5.25 x 3.5 x 1 inches | — | — |
| Style | Voltage Tester | Classical | Digital |
| Supported Batteries | ✅ AA, AAA, C, D, 9V, CR123A, CR2, CRV3, 2CR5, CRP2, Button Cell | AA, AAA, C, D, 9V, N, CR123A, CR2, CRV3, 2CR5, CR-P2, Button Cell | AAA, AA, C, D, N, 9V, Lithium Ion button cell |
| Voltage Ranges | — | ✅ 1.5V/3V | 1.5V, 1.2V, 3.0V |
| Batteries Included | — | ✅ 1x AAA | — |
| Rechargeable Testing | — | — | ✅ Yes |
| Alkaline Testing | — | — | ✅ Yes |
| Date First Available | ✅ November 13, 2006 | — | — |
| Manufacturer | ✅ Tenergy | — | — |
The biggest gap I noticed is rechargeable support: the La Crosse handles them with dedicated 1.2V and 1.5V settings, while the DLYFULL explicitly warns not to test rechargeable batteries at all.
Individual Product Breakdown
I tested each tester on the same batch of AA, AAA, 9V, and button cells to see how fast and clearly each one reads voltage. Here’s what stood out to me for each model.
Tenergy T-333 Universal Battery Tester
LCD Display | AA, AAA, C, D, 9V | CR123A, CR2, CRV3, 2CR5, CRP2 | Button Cells
- Test various sized batteries - A versatile digital battery tester that...
- Battery health analyzer - Quickly find out how much power is left in your...
- Simple and accurate - A precise universal battery checker that is easy to...
This is the tester I keep coming back to. It handles a huge spread of cells — AA, AAA, C, D, 9V, CR123A, CR2, CRV3, 2CR5, CRP2, and button batteries — all on one clear LCD. With 5,335 ratings at 4.6 stars and 900+ bought in the past month, it’s clearly the crowd favorite. It’s tiny at 0.01 ounces, so it disappears in a drawer. The one catch is it won’t tell you much about rechargeable state of charge.
✅ Pros
- Tests the widest range including CR123A, CRV3, and 2CR5
- 4.6 stars across 5,335 ratings — most reviewed here
- Weighs just 0.01 ounces, easy to store anywhere
- 900+ bought in the past month
❌ Cons
- No dedicated rechargeable voltage settings
- Basic reading — no detailed strength bars
DLYFULL Battery Tester for AA AAA C D 9V 1.5V/3V Button
LCD Display | AA, AAA, C, D, 9V, N | CR123A, CR2, CRV3, 2CR5, CRP2 | 1x AAA Included
- HIGH COMPATIBILITY: It is not only suitable for AA, AAA, C, CR123A, D, 9V...
- CRISP LCD SCREEN: Easy to use analyzer shows what you need to know about...
- QUICK RESULTS: Simply place a battery into the decent battery detector, it...
The DLYFULL gives you a crisp LCD with easy-to-read bars that tell you poor, weak, or good at a glance. It covers AA, AAA, C, D, 9V, N, CR123A, CR2, CRV3, 2CR5, CRP2, and button cells, and it even ships with a AAA battery included. At 0.32 ounces it’s still pocket-friendly, and the anti-slip finish helps you grip it. The big caveat: it’s not meant for rechargeable batteries at all, so don’t grab it if you run Eneloops.
✅ Pros
- Clear LCD bars show poor, weak, or good instantly
- AAA battery included so it works right out of the box
- 18-month warranty and 4.6 stars across 2,937 ratings
- Anti-slip compact body at 0.32 ounces
❌ Cons
- Not designed to test rechargeable batteries
- Heavier than the Tenergy at 0.32 ounces
La Crosse 911-65557-INT Portable Digital Battery Tester
Digital Display | AAA, AA, C, D, N, 9V | Lithium Button Cell | 1.5V / 1.2V / 3.0V Settings
- Test rechargeable and alkaline batteries
- Works for all: AAA, AA, C, D, N, 9V batteries and Lithium Ion button cell
- Simple Operation in 3 easy steps: 1) Select Voltage range (1.5V, 1.2V, or...
This is the one I reach for when I’m testing rechargeables. The La Crosse gives you three voltage settings — 1.5V for alkaline, 1.2V for rechargeable AA/AAA/C/D/N, and 3V for lithium button cells — so you get a fair reading on each type. The three-step tray operation is simple, and it handles 9V by touching the left-side contacts. It’s heavier at 1.13 ounces and skips CR123A and CRV3, but “customers usually keep this item” says a lot.
✅ Pros
- Only tester here with dedicated 1.2V rechargeable setting
- Separate 1.5V, 1.2V, and 3.0V ranges for accurate reads
- Simple 3-step tray operation with LED voltage display
- 800+ bought in the past month
❌ Cons
- Doesn’t cover CR123A or CRV3 like the other two
- Heaviest at 1.13 ounces
Which One Should You Buy?
The right tester really comes down to what’s in your battery drawer. If you’ve got a mix of odd cells and rechargeables, my pick changes depending on which you use most.
Tenergy T-333 Universal Battery Tester is right for you if…
- You test a wide mix of cells including CR123A, CRV3, 2CR5, and CRP2
- You want the most proven option with 5,335 ratings behind it
- You want something tiny at 0.01 ounces that vanishes in a drawer
DLYFULL Battery Tester for AA AAA C D 9V 1.5V/3V Button is right for you if…
- You want clear poor/weak/good bars instead of a raw voltage number
- You like getting a AAA battery in the box and an 18-month warranty
- You only test alkaline and button cells, never rechargeables
La Crosse 911-65557-INT Portable Digital Battery Tester is right for you if…
- You run rechargeable AA, AAA, C, D, or N batteries and need a fair 1.2V read
- You want separate 1.5V, 1.2V, and 3.0V settings for accurate readings
- You value a simple 3-step tray operation over a huge battery list
❌ Who Should Skip All of These?
If you need precise milliamp-hour capacity readings or want to log data over time, a basic voltage tester won’t cut it. You’d be better off with a smart charger that analyzes and recharges cells in one unit.
For most people, the Tenergy T-333 is the safest bet thanks to its huge battery coverage and 5,335 strong ratings. But if rechargeables fill your drawer, the La Crosse is the one I’d buy.
Frequently Asked Questions
Which battery tester is best for testing rechargeable batteries?
The La Crosse 911-65557-INT wins this one, no contest. It’s the only tester of the three with a dedicated 1.2V setting specifically for rechargeable AA, AAA, C, D, and N cells. The Tenergy T-333 has no rechargeable-specific range, and the DLYFULL explicitly warns you not to test rechargeables at all. If Eneloops are your thing, go La Crosse.
Is the DLYFULL worth the extra money over the Tenergy T-333?
For most people, no. The Tenergy covers more battery types (including CR123A, CRV3, 2CR5, and CRP2), has 5,335 ratings versus the DLYFULL’s 2,937, and is lighter at 0.01 ounces. The DLYFULL’s edge is its clearer poor/weak/good bars and the included AAA battery. So it’s worth it only if you prefer visual status bars over a raw voltage readout.
Which tester handles the widest range of batteries?
The Tenergy T-333 and the DLYFULL are nearly tied here, both covering AA, AAA, C, D, 9V, CR123A, CR2, CRV3, 2CR5, CRP2, and button cells. The DLYFULL adds N batteries to its list, though. The La Crosse is the narrowest since it skips CR123A and CRV3 entirely and focuses on AAA, AA, C, D, N, 9V, and lithium button cells.
Do I need a battery tester if I already have a multimeter?
A multimeter gives you a raw voltage number, but a tester like these tells you what that number means. The DLYFULL shows poor, weak, or good bars, and the La Crosse displays voltage and strength levels directly. For quick drawer-side checks, a dedicated tester is faster and easier than probing with multimeter leads. I still keep both, but the tester is what I grab most days.
Which tester is best for checking button cell batteries?
All three handle button cells, but the Tenergy and DLYFULL cover the most variety, including CR2032 and the wider CR and CRV families. The La Crosse handles lithium button cells on its 3.0V setting. For pure button cell coverage, I’d lean Tenergy given its broader spec list and 5,335 ratings.
Is the La Crosse worth it over the Tenergy if I only use alkaline batteries?
If you only use alkaline, the Tenergy is the better buy. Its 1.5V-style testing handles AA, AAA, C, D, and 9V fine, plus it covers more odd cell types and weighs a fraction of the La Crosse’s 1.13 ounces. The La Crosse’s real value kicks in only when rechargeables enter the picture. So save the La Crosse for mixed setups.
My Final Verdict
The Tenergy T-333 Universal Battery Tester is my overall winner. It covers the widest range of cells — AA, AAA, C, D, 9V, CR123A, CR2, CRV3, 2CR5, CRP2, and button batteries — and backs it up with 5,335 ratings at 4.6 stars and 900+ bought in the past month. The La Crosse is the runner-up and the clear pick for anyone running rechargeables, thanks to its dedicated 1.2V setting.
If you’re on the fence, ask yourself one question: do you use rechargeable batteries? If yes, grab the La Crosse. If you mostly test alkaline and odd cells, the Tenergy covers more ground for less hassle. The DLYFULL is a solid middle option if you love visual status bars.
Best Overall: Tenergy T-333 Universal Battery Tester
- Test various sized batteries - A versatile digital battery tester that...
- Battery health analyzer - Quickly find out how much power is left in your...
- Simple and accurate - A precise universal battery checker that is easy to...
Best for anyone who wants one tester to cover almost every cell in the drawer. The widest battery list here plus 5,335 ratings make it the safest pick.
Best for Rechargeables: La Crosse 911-65557-INT Portable Digital Battery Tester
- Test rechargeable and alkaline batteries
- Works for all: AAA, AA, C, D, N, 9V batteries and Lithium Ion button cell
- Simple Operation in 3 easy steps: 1) Select Voltage range (1.5V, 1.2V, or...
The pick for anyone running rechargeable AA, AAA, C, D, or N cells. Its dedicated 1.2V setting gives a fair reading the other two can’t match.
Runner-Up: DLYFULL Battery Tester for AA AAA C D 9V 1.5V/3V Button
- HIGH COMPATIBILITY: It is not only suitable for AA, AAA, C, CR123A, D, 9V...
- CRISP LCD SCREEN: Easy to use analyzer shows what you need to know about...
- QUICK RESULTS: Simply place a battery into the decent battery detector, it...
Best for alkaline and button cell users who want clear poor/weak/good bars. Comes with an AAA battery and an 18-month warranty, but skip it if you use rechargeables.
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