Dlyfull Battery Tester, LCD Display Universal Battery Checker for Ni-MH
Quick take
The Dlyfull B4 universal battery tester quickly checks many battery chemistries and sizes, showing both voltage and a remaining-charge percentage on an LCD. It is a good convenience tool for households that want to sort and troubleshoot batteries for flashlights, toys, and devices, but buyer feedback is mixed for repeat accuracy with some Ni-MH cells.
Pros and cons
Pros
- LCD display reports voltage plus a percentage and bar-style battery level.
- Designed for broad compatibility across multiple chemistries and common formats (cylindrical cells and button/pack types).
- Compact and portable, intended to be easy to keep around for quick checks.
- Simple operation, with a self-test triggered by holding the check button.
Cons
- Review evidence is limited, and repeat-read consistency may be weaker for certain Ni-MH batteries.
- Cylindrical testing can require holding positioning on the tester for a few seconds.
- Some buyer expectations focus on measuring “real health,” but this tester’s readout is voltage and an estimated level, not a full capacity test.
What buyers think
Buyer-review themes are generally centered on readability, speed, and whether the tester makes it easier to decide which batteries to reuse or recycle. Many users describe the LCD as easy to read and the device as handy for checking a wide range of household batteries (especially AA/AAA and common lithium formats used in flashlights and small electronics). A recurring “how usable is it” point is that the testing process for cylindrical cells can feel slightly awkward because the positive terminal design may require holding the battery in place briefly. Accuracy feedback is mixed: there are reports that readings seem accurate and more helpful than basic voltage-only checkers, but there is also at least one strongly negative account claiming inconsistent readings on Ni-MH batteries across repeated tests. Because the negative evidence is not supported by a large pattern in the snippet set, buyer-review evidence is too limited to guarantee repeat accuracy for every Ni-MH cell condition.
How the Dlyfull tester helps in real life
This tester is built around a simple goal: give you a quick snapshot of battery status rather than relying on “it seems to work” or guessing based on age. When you test a battery, you get an LCD readout that includes the measured voltage and a battery level indicator shown as both a percentage and a bar. That dual display is useful because voltage alone can be hard to interpret, especially when chemistries behave differently as they discharge.
Compatibility and what it can test
The Dlyfull B4 is marketed as a universal tester for multiple chemistries and several common battery formats. It is positioned for Ni-MH, Ni-CD, alkaline, lithium manganese, and LiFePO4, and it also supports lithium-ion packs. For size coverage, it supports common cylindrical sizes like AAA, AA, C, and D, plus other format types including 9V and 12V alkaline packs and certain button-cell and compact battery types.
Battery type fit matters: cylinder cells are tested using a pin and contact approach, while button or combination batteries are tested by placing them in the matching slots. If you mainly test one or two chemistries, you will likely get more consistent day-to-day results than if you expect identical repeat accuracy across every Ni-MH and lithium variant you own.
Display and usability
The LCD display is a core part of the product experience. Buyers who like it emphasize readability, and the percentage readout is a practical feature for quick triage. The operation is straightforward, with a self-test step triggered by holding the check button for a few seconds (an error indicator may appear if testing does not start properly).
One usability tradeoff that shows up in feedback is handling. Cylindrical testing can require holding the battery in an “awkward” position for a few seconds so the positive contact sits correctly. For many shoppers that is a minor inconvenience, but if you plan to test dozens of batteries frequently, this handling detail can add up.
Pros and cons, summarized
Best for
- Households that want a compact universal battery tester for everyday device batteries.
- People who prefer an LCD percentage plus voltage, not just a basic voltmeter.
- Sorting and troubleshooting batteries in flashlights, toys, remotes, and other common electronics.
Who should be cautious
- Shoppers who primarily rely on Ni-MH rechargeables and need highly consistent repeat readings for the same pack.
- Anyone expecting a true capacity test (this product focuses on voltage and estimated battery level).
- Buyers who dislike test devices that require holding positioning to get a stable contact.
Verdict
The Dlyfull B4 universal battery tester is a convenient tool for quickly checking many battery types and getting both voltage and an estimated remaining-charge level on a clear LCD. It looks like a strong fit for general household battery sorting, especially for common alkaline and lithium formats used in everyday devices. If your main concern is dependable repeat accuracy across a large mix of Ni-MH rechargeables, consider using a repeat-check routine (for example, retesting the same cell) and be prepared that some Ni-MH feedback has been less consistent.
Price and availability
Pricing can vary by retailer and time. You can check the latest price and options here: Buy on Amazon.
FAQs
What batteries does the Dlyfull B4 tester support?
It is designed to test multiple chemistries (including Ni-MH, Ni-CD, alkaline, lithium types, and LiFePO4) and many common battery formats (such as AA, AAA, C, D, 9V, and 12V packs, plus button/compact types). Your exact results depend on selecting the correct contact or slot for the battery form factor.
Does it show voltage only?
No. The LCD shows both the battery’s voltage and a battery level indicator. The level is displayed as a percentage and also as a bar-style readout.
Is it accurate for Ni-MH rechargeable batteries?
Buyer feedback is mixed. Some users report consistent, useful readings, but at least one detailed report claims inconsistent results on Ni-MH packs across repeated tests. Buyer-review evidence is limited, so if Ni-MH accuracy is critical for you, it is smart to retest the same cell for confirmation.
Is it hard to use?
Operation is simple, with a button press and a brief hold to start testing. The main usability tradeoff noted by some buyers is that cylindrical testing may require holding the battery in an “awkward” position for a few seconds to get stable contact.
Will it work as a capacity tester?
This type of tester is focused on voltage and estimated charge level, not a full capacity or load test that measures how long a battery will run under real device conditions.
Specifications
| Product Title | Dlyfull Battery Tester, LCD Display Universal Battery Checker for Ni-MH, Ni-CD, Li-ion, Alk & LiFe04 Batteries(AA AAA C D 9V 12V 18650 CR123A 2CR5 CR2032 Cells), 2X AAA Batteries Included |
|---|---|
| Category | Electronics > Household Batteries, Chargers & Accessories > Battery Testers |
| Brand | DLYFULL |
| Manufacturer | Dlyfull |
| Color | Black |
| Item Weight | 0.3 Pounds |
| Power Source | Battery Powered |
| Minimum Operating Voltage | 3 Volts |
| Style Name | Black |
| Item Dimensions | 6.1 x 3.6 x 0.9 inches |
| Specification Met | CE, FCC, RoHS |
| Brand Name | DLYFULL |
| UPC | 825665404983 |
| Part Number | B4 |
| Included Components | 1*Dlyfull B4 Battery Load Tester; 2* AAA Batteries; Welcome Guide |
| Unit Count | 2.0 Count |
| Style | Black |
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