Dlyfull Battery Tester, LCD Display Universal Battery Checker for Ni-MH, Ni-CD, Li-ion, Alkaline
Quick take
The Dlyfull DB1 is a universal battery tester that uses an LCD display to show battery voltage and health for a wide mix of chemistries and common sizes, including AAA/AA/C/D, 9V, 18650, CR123A, CR2032, and LR44. It is a simple, one-touch tool designed for quick “keep or replace” checks, with USB-C recharging and a magnetic slot that helps hold cells steady. The main catch is that it tells you voltage status, it does not charge batteries.
Pros and cons
Pros
- Universal compatibility across multiple battery types (Ni-MH/Ni-CD, alkaline, lithium and Li-ion variants, plus many sizes and button cells).
- LCD readout with clear “good, weak, or poor” style indication for voltage health.
- Magnetic battery slot and sliding/locking feel designed for easier one-hand testing.
- USB-C rechargeable design, with reported up-to-15-hour runtime per full charge.
Cons
- Works as a tester, not a battery charger, so you still need a separate charger for rechargeable cells.
- Because it cycles through battery types, you need to select the correct chemistry before testing for best results.
- Not ideal if you only use a single battery size, since you may pay for extra compatibility you do not need.
What buyers think
Buyer review evidence is limited, but the recurring themes in the available snippets focus on usability and speed: people like replacing probe-based testing with a dedicated tester that is straightforward to use. Several comments highlight the convenience of the magnetic slot and the ergonomic feel for quick checks, and multiple buyers mention that the digital voltage/health display is helpful for sorting “good” versus “weak” batteries. A small set of reviews also points to real-world usefulness for mixed batteries, including less common voltages like 3.7V cells used in devices such as yard lights and coin-cell applications.
Compatibility and battery types it can check
This universal battery tester is built to handle several common chemistries and voltage ranges. It supports approximately:
- 1.2V Ni-MH and Ni-CD cells
- 1.5V alkaline batteries
- 3.0V lithium batteries
- 3.7V Li-ion batteries
- 9.0V batteries
For battery formats, it is designed for a broad set of sizes, including AAA, AA, C, SC, D, 9V, and larger cells like 18650. It also lists support for popular button cells and specialty cells such as CR123A, CR2032, and LR44.
How the tester works (and why that matters)
The DB1 uses an LCD display to show the voltage and provides a health indication that helps you categorize the cell as good, weak, or poor. That is especially useful when you have a drawer full of batteries of different ages or when you need a quick answer for “why did this remote stop working?”
Operationally, it is designed for one-touch use: a V-SELECT button helps cycle through battery types, and controls include a quick double-press for buzzer on or off and a long press to power down. If you often test different chemistries back-to-back, the selection step is important, because the tester expects the correct battery type mode for accurate results.
Design details that affect day-to-day use
Magnetic battery slot for steadier testing
Instead of requiring multiple probes or awkward contact placement, the tester uses a magnetic slot approach. Buyers specifically mention the magnets, grooves, and sliding mechanism as part of why it feels easier to use, especially when you are testing a box of mixed or “mystery” batteries.
USB-C rechargeable power
The tester is rechargeable via USB-C input, with a full-charge runtime claimed up to 15 hours. That makes it more convenient than disposable battery-powered testers if you plan to use it more than occasionally. It is also compact enough to keep in a drawer or near your workshop.
Pros and cons (realistically)
Good fit if you want quick sorting for mixed households batteries
If you have devices that use different batteries, like remotes, yard lights, smoke detectors (where applicable), flashlights, and assorted electronics, this kind of universal voltage checker can help you identify cells that are likely past their useful range. The LCD display makes it easier to avoid guesswork compared to “it seems weaker” testing.
Not the right tool if you need charging
Because this is designed to check voltage, it will not replace a charger. If your main goal is to revive rechargeable cells, you will still want a separate Ni-MH or multi-chemistry charger. Treat the DB1 as a triage tool: test first, then charge or replace based on what you see.
Is the Dlyfull DB1 worth it?
The Dlyfull DB1 is worth considering if you want a compact, easy-to-use universal battery tester that covers common household sizes plus button cells and popular lithium formats, with a clear LCD readout and a magnetic slot to streamline testing. If you only use one battery size, or if your priority is actually charging rather than checking, you may prefer a simpler dedicated solution or invest in a proper charger instead.
Alternatives to consider
Since no specific competing models were provided here, use these comparison criteria when shopping:
- If you test mostly rechargeable AA/AAA: look for a tester that focuses on Ni-MH/Ni-CD and fits your common sizes.
- If you mostly use button cells and remotes: prioritize compatibility with CR2032, LR44, and other coin cells plus a stable contact design.
- If you also want charging: consider a charger-first approach, because testers and chargers solve different problems.
Price and availability
Pricing and stock can change by retailer and region. Use the button below to check the latest cost and availability.
FAQ
Note: The FAQ below focuses on buying-relevant details like compatibility, operation, and practical expectations.
Does the Dlyfull DB1 charge batteries?
No. It is a battery tester designed to read voltage and health indications, so you will still need a separate charger for rechargeable cells.
What battery sizes and types does it support?
It is designed for multiple chemistries and a wide range of sizes, including AAA, AA, C, SC, D, 9V, 18650, CR123A, CR2032, and LR44, along with Ni-MH/Ni-CD, alkaline, and lithium/Li-ion battery voltage ranges.
How do you switch between battery types?
You use the V-SELECT button to cycle through battery types before testing, so you are matching the mode to the cell you are checking.
Is the display helpful for deciding whether to keep or replace batteries?
Yes, the LCD provides a digital voltage/health indication intended to show whether a battery is good, weak, or poor, which makes sorting faster than using an approximate method.
How is it powered?
It is rechargeable via a USB-C input, with a reported up-to-15-hour runtime after a full charge.
Is this tester hard to use?
Based on buyer feedback, the combination of one-touch controls and a magnetic slot makes it simpler than testing batteries with loose probes.
Specifications
| Product Title | Dlyfull Battery Tester, LCD Display Universal Battery Checker for Ni-MH, Ni-CD, Li-ion, Alkaline, 1.5V/3V Button Cell Batteries(AAA AA C D 9V 18650 CR123A LR44 CR2032 Cells), Cable Included |
|---|---|
| Category | Electronics > Household Batteries, Chargers & Accessories > Battery Testers |
| Brand | DLYFULL |
| Manufacturer | DLYFULL |
| Color | Black and Blue |
| Item Weight | 0.2 Pounds |
| Power Source | Battery Powered |
| Minimum Operating Voltage | 1.2 Volts |
| Measurement Type | Volts |
| Compatible Devices | Devices that use AAA, AA, C, D, 9V, 18650, CR123A, CR2032, LR44, and other supported battery sizes and types |
| Style Name | Compact and minimalist, yet infused with a digital vibe and a touch of traditional mechanical charm. |
| Item Dimensions | 3.7 x 2.5 x 1.1 inches |
| Specification Met | FCC, IEC62133, RoHS |
| Brand Name | DLYFULL |
| Model | DB1 |
| UPC | 825665405515 |
| Part Number | DB1 |
| Included Components | 1*DB1 Battery Tester; 1*USB-C Charging Cable; 1*User Manual |
| Unit Count | 1.0 Count |
| Style | Compact and minimalist, yet infused with a digital vibe and a touch of traditional mechanical charm. |
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