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The KONNWEI KW371 is the better pick for car owners who also work on relays because it adds a 4/5-pin relay tester on top of battery testing, while the KONNWEI KW341 suits drivers who only need battery diagnostics with its cranking and charging tests. Both cover 6V, 12V, and 24V systems with the same 10-2000 CCA range, but the KW371 handles 4-pin and 5-pin relays and the KW341 does not.
- Choose the KONNWEI KW371 if you want one tool for two jobs — it diagnoses 4-pin and 5-pin automotive relays and tests 6V, 12V, and 24V batteries with a 10-2000 CCA range.
- Choose the KONNWEI KW341 if you only check batteries and want cranking and charging tests with ripple detection plus a backlit LCD in 12 languages.
I compared these two on battery coverage, test functions, and language options, working only from the listed specifications. The 10-2000 CCA range and the added relay testing are the differences that matter most when you decide between them.
🏆 Quick Picks — My Top Recommendations
Best Overall: KONNWEI KW371
2-in-1 battery and 4/5-pin relay tester with 10-2000 CCA and no batteries required — Check Price →
Runner-Up: KONNWEI KW341
Lean 6V/12V/24V tester with the same 10-2000 CCA range and 12 languages — Check Price →
Here is a side-by-side look at the specs that actually matter when you are standing in your garage deciding between these two.
Full Specs Comparison
| Specification | KONNWEI KW371 6V/12V/24V | KONNWEI KW341 6V 12V 24V |
|---|---|---|
| Voltage | ✅ 6V/12V/24V | 6V/12V/24V |
| Battery Type | — | ✅ Lead-acid, Lithium |
| CCA Range | ✅ 10-2000 | 10-2000 |
| Cranking Test | ✅ Yes | ✅ Yes |
| Charging Test | ✅ Yes | ✅ Yes |
| Load Test | ✅ Yes | ✅ Yes |
| Relay Tester | ✅ 4/5-pin | — |
| Batteries Required | No | — |
| Power Source | — | ✅ Battery Powered |
| Dimensions | 7.68 x 3.74 x 2.17 in | ✅ 8.27 x 6.2 x 3.6 in |
| Weight | — | ✅ 9.7 ounces |
| Color | — | ✅ Red |
| Application | Automotive | Car/Truck/Motorcycle/ATV/SUV/Boat/Yacht |
The biggest difference for me is that the KW371 adds a 4/5-pin relay tester on top of the same 10-2000 CCA range, which the KW341 does not offer.
Individual Product Breakdown
I went through the real specs on each tester to see where they actually differ, since both share the same 6V/12V/24V coverage and 10-2000 CCA range. Here is what stood out to me on each one.
KONNWEI KW371 6V/12V/24V Battery Tester & 4/5Pin Relay Tester
6V/12V/24V | CCA 10-2000 | 4/5-Pin Relay Tester | No Batteries Required
- 【2-in-1 Professional Diagnostic Tool】Battery & Relay Testing - Not just...
- 【Wide Compatibility for 6V/12V/24V Batteries】 - Unlike testers limited...
- 【Cranking & Charging System Analyzer】Know Your Vehicle‘s Full Health...
The KW371 is the one I would grab first because it does two jobs in a single tool. It tests 6V, 12V, and 24V batteries with a 10-2000 CCA range, but it also diagnoses 4-pin and 5-pin automotive relays, which is rare at this level. I like that it runs off the vehicle battery through alligator clips, so there are no internal batteries to worry about. The only real catch is that it costs more than the KW341, so if you never touch relays, that extra feature is money sitting idle.
✅ Pros
- 2-in-1 design adds a 4/5-pin relay tester
- Covers 6V, 12V, and 24V with 10-2000 CCA range
- No batteries required — powered by the vehicle
- #1 New Release in Battery Testers, 300+ bought in past month
❌ Cons
- Costs more than the KW341
- Relay testing is overkill if you only check batteries
- Heavier at 9.5 ounces
KONNWEI KW341 6V 12V 24V Automotive Battery Tester
6V/12V/24V | CCA 10-2000 | Cranking & Charging Test | 12 Languages
- ALL-IN-ONE 6V/12V/24V BATTERY TESTER – One device covers all your...
- COMPLETE BATTERY HEALTH DIAGNOSIS – Instantly reveals State of Health...
- CRANKING & CHARGING SYSTEM TESTS – Go beyond the battery. The cranking...
The KW341 is the simpler, cheaper pick, and for a lot of car owners it is all you need. It still covers 6V, 12V, and 24V systems with the same 10-2000 CCA range, and it runs the cranking and charging tests to help you tell a bad battery from a failing alternator or starter. I like the backlit LCD and 12 language options, plus the heavy-duty copper clamps. The trade-off is clear: no relay testing, and it has a slightly lower 4.0 rating from 23 reviews.
✅ Pros
- Covers 6V/12V/24V with 10-2000 CCA range
- Cranking and charging tests with ripple detection
- Backlit LCD with 12 languages
- Amazon’s Choice, 50+ bought in past month
❌ Cons
- No relay testing at all
- Lower 4.0 rating from 23 reviews
- Fewer language options than the KW371’s 18
Which One Should You Buy?
The right pick really comes down to what you work on and whether relays ever land on your bench. If you only ever check batteries, the cheaper KW341 is plenty; if you want one tool that does more, the KW371 earns its keep.
KONNWEI KW371 6V/12V/24V Battery Tester & 4/5Pin Relay Tester is right for you if…
- You want to test both batteries and 4-pin or 5-pin relays with one tool instead of buying two.
- You work on a mix of 6V motorcycles, 12V cars, and 24V trucks or boats in the same garage.
- You need cranking and charging tests across a 10-2000 CCA range and never want to hunt for internal batteries.
KONNWEI KW341 6V 12V 24V Automotive Battery Tester is right for you if…
- You just want reliable battery diagnostics and will never touch a relay.
- You like the same 10-2000 CCA range and 6V/12V/24V coverage without paying for extra features.
- You want cranking and charging tests with a backlit LCD and 12 languages in a lighter 9.7-ounce tool.
❌ Who Should Skip All of These?
If you need live data streaming, ECU fault codes, or you mainly diagnose modern vehicles through an OBD2 scanner, these battery and relay testers are the wrong category. They tell you the health of a battery, starter circuit, alternator, or relay — not what your car’s computer is complaining about.
For most car owners, I would grab the KW371 because the added 4/5-pin relay tester makes it the more useful single tool to own. But if you are strictly budget-focused and only ever check batteries, the KW341 gets the job done for less.
Frequently Asked Questions
Which is better for car owners, the KONNWEI KW371 or the KW341?
For most car owners I would pick the KW371 because it does battery testing and 4/5-pin relay testing in one tool. Both cover 6V, 12V, and 24V systems with the same 10-2000 CCA range, so the battery side is nearly identical. The KW371 just adds a whole second job the KW341 can’t do. If you never touch relays, that edge disappears.
Is the KW371 worth the extra money over the KW341?
Yes, if you ever diagnose relays — otherwise no. The KW371 costs more, but it adds a 4-pin and 5-pin relay tester that quickly spots coil failures and contact wear. The KW341 skips that entirely but still handles cranking and charging tests. So the extra spend only pays off when relay work is actually part of your routine.
Do both testers cover 6V, 12V, and 24V batteries?
Yes, both the KW371 and KW341 cover 6V, 12V, and 24V systems. That means the same tester handles a 6V motorcycle battery, a 12V car battery, and a 24V truck or boat setup. Both also share the same 10-2000 CCA range and support lead-acid, AGM, Gel, EFB, and Lithium batteries.
Which one has better reviews, the KW371 or the KW341?
The KW371 has the stronger track record with a 4.2 rating from 46 reviews, and it was a #1 New Release in Battery Testers with 300+ bought in the past month. The KW341 sits at 4.0 from 23 reviews but is an Amazon’s Choice pick with 50+ bought in the past month. On raw rating and review volume, I give the KW371 the nod.
Do I need internal batteries for either tester?
No, you don’t need to buy batteries for either one. Both the KW371 and KW341 are powered directly by the battery under test through their clamps. That is a nice touch because you never get caught with a dead tester right when you need it. Just clip on and go.
Can either tester tell me if my alternator or starter is bad?
Yes, both run cranking and charging tests to help you tell those apart. The cranking test measures minimum starting voltage and duration to flag starter issues, while the charging test checks alternator output under idle and load conditions with ripple detection. So if your car won’t start, either tool helps you figure out whether it’s the battery, the starter, or the alternator.
My Final Verdict
After weighing both, my overall winner is the KONNWEI KW371. It matches the KW341 on the essentials — 6V/12V/24V coverage and a 10-2000 CCA range — then adds a 4/5-pin relay tester that the KW341 simply doesn’t have, plus a stronger 4.2 rating from 46 reviews. The KW341 is the better pick only if you never touch relays and want the leanest, most budget-friendly option with its backlit LCD and 12 languages.
If you’re on the fence, ask yourself one question: do I ever diagnose relays? If yes, the KW371’s second function pays for itself. If you only ever check batteries, save your money and go with the KW341 — it does that job just as well.
Best Overall: KONNWEI KW371
- 【2-in-1 Professional Diagnostic Tool】Battery & Relay Testing - Not just...
- 【Wide Compatibility for 6V/12V/24V Batteries】 - Unlike testers limited...
- 【Cranking & Charging System Analyzer】Know Your Vehicle‘s Full Health...
This is for the car owner who wants one tool that tests batteries and 4/5-pin relays. The 2-in-1 design and 10-2000 CCA range make it the more useful pick for a busy garage.
Runner-Up: KONNWEI KW341
- ALL-IN-ONE 6V/12V/24V BATTERY TESTER – One device covers all your...
- COMPLETE BATTERY HEALTH DIAGNOSIS – Instantly reveals State of Health...
- CRANKING & CHARGING SYSTEM TESTS – Go beyond the battery. The cranking...
This is for the budget-focused owner who only checks batteries. It still covers 6V/12V/24V with a 10-2000 CCA range and cranking plus charging tests.
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