For battery cells, review the product description for real-world current recommendations, testing notes, and application guidance. Manufacturer maximum ratings should be treated as limits, not the best target for long-term pack health.
Description
Compact open-frame battery monitor that shows live pack voltage and a five-step, voltage-derived charge-level estimate.
The numeric display helps you check system voltage at a glance. The bar display is an estimate based on voltage; it does not count amp-hours or watt-hours and is not a coulomb counter. Load, charging state, temperature, battery age, and chemistry can all affect the indicated level.
Received display-color options
- Blue
- Green
- Red
Each selection includes one indicator module in the chosen display color.
Electrical limit
| Supplier-stated input range | DC 7–40V |
|---|---|
| Connection points | Board pads marked VCC and GND |
| Display | Digital voltage reading plus five charge-level segments |
Use the battery’s highest possible charged voltage—not only its nominal label—to confirm compatibility. A battery described as “36V” or “48V” may exceed 40V when fully charged, so those nominal labels do not establish safe compatibility.
Similar-looking revisions are sold with different voltage limits by display color. DIY500AMP applies the conservative 40V maximum to every received color unless that exact unit is independently verified.
Installation and verification
- Disconnect the battery and confirm the pack’s maximum charged voltage is within the stated range.
- Connect VCC to battery positive and GND to battery negative with correctly rated, insulated wiring and appropriate branch-circuit protection.
- Verify polarity before applying power. Reverse polarity or overvoltage can damage the module.
- Compare the displayed voltage with a trusted meter at several operating points before permanent installation.
- Treat the bar display as a relative guide until its full-to-empty behavior has been checked with your specific chemistry and pack.
Indicator only. This module is not a charger, BMS, cell balancer, fuse, low-voltage disconnect, or other safety device.
The board is open-frame and is not advertised as waterproof. Mount it where the electronics and connections are protected from shorts, conductive debris, moisture, vibration, and strain.
Ships from DIY500AMP.COM in Florida when in stock.
Orders ship from Florida when inventory is available. Lithium-ion cells require proper handling, protected packs, correct chargers, and safe storage. Do not solder directly to battery terminals.
Payment and Security
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Everything is great 100%recommended fast and
Everything is great 100%recommended fast and professional
Daniel Kammerdiener
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One of my cell orders was short one cell. When I went to send a text to the customer contact (this is rare and awesome way to reach out), the reply on a national holiday came within 15 min. That level of customer service is incredible, like family. I really appreciate that!
Joseph Krienert
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Wow, these cells are great!
I purchased some of these tabless cells to try on my 1S 3" HD Toothpick drone build, and, albeit a bit heavy for 1S, it flies pretty well. Not a freestyle monster, but an endurance beast with decent send. These cells shrug off the demands of a BETAFPV Matrix HD AIO flight controller/12A ESC and some 1202.5 11000KV motors. I'm getting 15+ minutes of speedy flight time from a single cell trying not to go below 3.2V, and about 20+ minutes cruising. Love these cells and will definitely buy more when time comes, only from DIY500AMP, who are terrific!
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