1S 2S 3S 4S 5S 6S 7S 8S Lithium Battery Capacity Indicator Module (4-Section, 5 Pack)
Quick take
This 4-LED capacity indicator module is designed to show lithium battery pack status across 1S to 8S by reading pack voltage and lighting blocks as voltage thresholds are met. It is a good fit for projects and benches where you want a quick visual check, but you will need to select and connect the correct series pads (and do a bit of soldering or jumper setup). Also note it is not waterproof, so it needs dry use.
Pros and cons
Pros
- Supports lithium packs from 1S up to 8S with voltage-based 4-level display.
- Wide operating voltage range (3 to 34V) and low power draw (5mA working current).
- Bright LED blocks with selectable display color (blue or green).
- Compact PCB and very light for integrating into battery projects.
Cons
- Accuracy is limited to voltage thresholds, not a detailed discharge curve or true remaining-capacity estimate.
- Requires correct S1 to S8 wiring or pad selection, which can be confusing if you skip the setup step.
- Not waterproof, best used indoors or in dry enclosures.
What buyers think
Buyer-review evidence for this module is generally positive, with multiple mentions that it works as a voltage-based charge indicator and that the LED display is bright. Common setup-related feedback points to the importance of soldering or moving the correct pins/jumper for the intended battery string count, since an incorrect connection can prevent the expected display. There is also feedback that the module is not as “discrete” as some shoppers may prefer, even though it matches the described size in listings and photos. Overall, the review pattern supports a simple, functional LED voltage indicator that rewards careful installation.
How this module shows battery “capacity”
This is a voltage-to-LED indicator. You connect the module’s positive and negative display ports to the battery pack you want to test, then the LED blocks illuminate based on voltage thresholds. For a given number of series cells (N), the module uses step points tied to approximate per-cell voltages:
- Over N × 3.3V, it illuminates 1 block.
- Over N × 3.5V, it illuminates 2 blocks.
- Over N × 3.7V, it illuminates 3 blocks.
- Over N × 3.9V, it illuminates all 4 blocks.
- Below N × 3.3V, the 4-block display turns off (the listing suggests charging when it drops below that level).
Important limitation: Because it is threshold-based, it is best treated as a quick visual state indicator rather than a precise measurement of remaining capacity. Real-world discharge curves and load effects can cause voltage to behave differently than a pure “percentage” gauge.
Compatibility and wiring you need to get right
This module is meant for lithium battery packs (lithium-ion and lithium-polymer use cases). It is intended for packs configured in series, such as 2S, 3S, and up through 8S. To match the module to your pack, you select the corresponding S1 through S8 connection (the module has shorting/pad choices), and the guidance emphasizes that only the appropriate connection should be used at one time.
Practical takeaway: if you wire the wrong series option, the LEDs may not match your pack’s voltage as you expect. Several buyers specifically call out that soldering, jumper movement, or selecting the correct pins is essential for proper operation.
Key specifications that matter for buying
- Pack support: 1S to 8S lithium battery strings (select the correct S pad for your pack count).
- Working voltage: 3 to 34V.
- Working current: 5mA.
- Operating temperature: -20°C to 50°C.
- Display: 4 LED blocks, with blue or green display blocks.
- Water resistance: not waterproof, intended for dry environments.
- Size/weight: PCB around 44 × 17 mm, display around 31 × 20 × 8 mm, about 6 g.
- Pack format note: guidance warns not to exceed maximum voltage per series count, described as 4.3 × N (for example, for 3S, maximum is 12.9V).
Pros and cons for different battery-test jobs
Best for
- DIY packs and small projects where you want an at-a-glance LED status indicator.
- Bench checks of lithium pack voltage before charging or during troubleshooting.
- Builders who are comfortable with basic soldering/jumper selection to match S1 through S8.
Who should avoid it
- Buyers who want a precise fuel-gauge (true remaining capacity, not just voltage thresholds).
- Anyone planning outdoor or wet-use installs, since it is not waterproof.
- Shoppers who need “plug-and-play” with no wiring or setup, because correct pad/pin selection is part of getting correct results.
Verdict: is it worth it?
If your goal is a simple, compact LED indicator that maps lithium pack voltage to four visual steps, this module can be a practical choice, especially for 1S to 8S projects. The most important buying caveat is setup accuracy. You will need to match the module to your pack’s series count correctly and accept that the reading is voltage-threshold based, not a detailed capacity calculation.
Price and availability
Because pricing can change, check the current listing for the latest cost and whether the 5-pack option is available. Use the button below to view the most up-to-date price on the retailer site.
FAQ
How do I choose the correct 1S to 8S setting?
Select the pad/jumper location that corresponds to your battery’s series count (N), then connect the module to the pack’s positive and negative terminals. Only the appropriate series connection should be used at a time.
Does this module measure state of charge or just voltage?
It’s a voltage-based indicator. It lights 1 to 4 LED blocks when voltage crosses preset thresholds for the selected series count.
What do the 4 LED blocks represent?
The blocks correspond to approximate per-cell voltage thresholds (for N series), moving from 1 block above N×3.3V up to 4 blocks above N×3.9V.
Is it waterproof?
No. It is not waterproof, so it should be used in a dry environment or inside a protected enclosure.
What lithium battery types is it for?
It is intended for lithium batteries, commonly used in lithium-ion and lithium-polymer pack setups, where you are testing series-connected cells.
Will the display be accurate under load?
Since the indicator is threshold-based on voltage, load conditions can affect pack voltage. For a best reference, test at a consistent moment in your workflow and use it as a quick visual check rather than a precise capacity percentage.
Specifications
| Product Title | 1S 2S 3S 4S 5S 6S 7S 8S 1-8S Lithium Battery Capacity Indicator Module 4 Sections Green LED Display Tester Li-po Li-ion (5 Pack) |
|---|---|
| Category | Electronics > Household Batteries, Chargers & Accessories > Battery Testers |
| Brand | Haldzemo |
| Manufacturer | Haldzemo |
| Color | Green |
| Power Source | Battery Powered |
| Minimum Operating Voltage | 3 Volts (DC) |
| Upper Temperature Rating | 50 Degrees Celsius |
| Measurement Type | Voltmeter |
| Compatible Devices | Lithium batteries |
| Style Name | Compact |
| Specification Met | CE, RoHS |
| Brand Name | Haldzemo |
| Part Number | HZ007 |
| Included Components | NO |
| Unit Count | 5.0 Count |
| Style | Compact |
| Min. Operating Voltage | 3 Volts (DC) |
Available variants
Color
- Green
- Blue
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