Etronix Cellmeter Battery Capacity Checker with 7 Reading Display ET0501

Overview

The Etronix Cellmeter Battery Capacity Checker ET0501 is an essential diagnostic tool for every RC enthusiast in the UK, whether you're running RC cars, RC helicopters, RC drones, or any other battery-powered model. This compact and user-friendly device allows you to monitor the condition of your rechargeable battery packs at the bench or out in the field, ensuring your batteries are always in peak condition before you head out for a session. Battery management is critical to maximising the lifespan of your packs and maintaining safe operation, and the Cellmeter makes this process straightforward and accurate.

If you're serious about your RC hobby—whether you're a casual weekend basher or a competitive racer—you'll quickly discover that proper battery monitoring is just as important as having the right charger. The Etronix Cellmeter measures seven different readings from your batteries, giving you comprehensive insight into the health and balance status of your packs. This unit supports all the most common battery chemistries used in modern RC models, including LiPo, LiFe, Li-ion, NiCd and NiMH batteries, making it a genuinely universal solution for the diverse RC community in the UK.

The Etronix Cellmeter won't be long before you wonder how you managed without it. Once you've used this battery checker a few times, monitoring your packs becomes second nature, and you'll gain confidence that your batteries are safe, balanced and ready to deliver peak performance every single time you use them.

Key Features

• Seven Comprehensive Readings — The Cellmeter displays total voltage, total battery capacity, individual cell voltage, lowest cell voltage, highest cell voltage, and voltage difference between cells. This multi-faceted approach to battery assessment means you can evaluate both the overall health of your pack and spot any cells that might be imbalanced or degraded, helping you identify problems before they become safety issues.
• Support for 2–7 Cell Packs — Whether you're running 2-cell, 3-cell, 4-cell, 5-cell, 6-cell or 7-cell battery configurations, the Cellmeter accommodates them all. This flexibility means a single device covers virtually every battery pack in your RC collection, from smaller sub-250g drone batteries to larger truck and helicopter packs.
• Multiple Battery Chemistry Support — The unit works seamlessly with LiPo, LiFe, Li-ion, NiCd and NiMH chemistries, making it truly universal across the RC hobby. Whether you're running modern lithium packs or older nickel-based batteries, the Cellmeter delivers accurate readings across all battery types.
• Pack and Individual Cell Voltage Display — The device shows you both the total voltage of your pack and the voltage of each individual cell. This is invaluable for identifying weak or failing cells that might not be visible from pack voltage alone, and it's essential for maintaining balanced packs that charge and discharge evenly.
• Lowest and Highest Cell Voltage Indication — Quickly identify which cells in your pack are performing best and which may need attention. The Cellmeter highlights the lowest and highest cell voltages so you can immediately see if your pack is balanced or if cells are drifting apart.
• Voltage Difference Measurement — The voltage difference reading tells you at a glance how much variation exists between your pack's strongest and weakest cells. A small difference indicates a well-balanced pack, whilst a large difference suggests your pack needs rest or may require servicing.
• Total Battery Capacity Display — See the overall capacity reading of your pack, which helps you understand remaining charge and plan your usage accordingly. This feature is particularly useful when assessing whether an older pack is still worth using or whether it's time to retire it.
• Compact Portable Design — The Cellmeter is small enough to fit in your field box or pocket, making it convenient to check your batteries anywhere—at the track, in your garage, or on holiday. Despite its compact size, it delivers professional-grade battery analysis.

Technical Performance

The Etronix Cellmeter ET0501 delivers reliable and accurate battery diagnostics through straightforward electronic measurement. The device features multiple connector options to accommodate different battery types: LiPo batteries connect directly via the balance port on the side of the unit, whilst NiMH and other battery types can be connected using a servo-type connector (subject to making up the appropriate lead with the correct connectors for your specific batteries). The unit measures and displays voltage readings with precision, allowing you to assess the state of charge and balance status of your packs before every use. Its engineering ensures consistent accuracy across all supported battery chemistries and cell configurations from 2 to 7 cells. The device is built to be durable and reliable, making it a worthwhile investment that will serve your RC hobby for years to come. Whether you're running a 2S LiPo in a small brushless RC car, a 6S pack in a high-powered truck, or nickel-based batteries in vintage RC models, the Cellmeter provides the diagnostic capability you need to keep your equipment running safely and efficiently.

What's in the Box

• Etronix Cellmeter Battery Capacity Checker unit
• Balance port connector cable for LiPo batteries

What You Need to Complete

• Servo connector lead for NiMH and NiCd batteries (if testing batteries without balance connectors)
• Your rechargeable battery packs in any supported chemistry

Frequently Asked Questions

• Is the Etronix Cellmeter suitable for beginners to the RC hobby? — Absolutely. The Cellmeter is designed to be user-friendly and intuitive, making it perfect for newcomers to RC as well as experienced enthusiasts. If you're just starting out with RC cars, RC helicopters or any other models, learning to check your batteries properly is an excellent habit to establish early. The device clearly displays readings that are easy to understand, and checking your pack takes just a few seconds.
• What battery connector types does the Cellmeter support? — The unit features a balance port connector for LiPo batteries, which allows direct connection to most modern lithium packs. For NiMH and NiCd batteries, you'll need to use the servo-type connector on the side of the unit. Some users construct custom leads to match their specific battery connectors (such as Traxxas or EC3 connectors), making the device compatible with virtually any pack in your collection.
• Can I check both LiPo and NiMH batteries with the same device? — Yes, this is one of the Cellmeter's greatest strengths. A single unit handles LiPo, LiFe, Li-ion, NiCd and NiMH batteries, so you don't need to buy separate checkers for different battery types. This makes it an economical choice for hobbyists who run multiple chemistry types.
• What does the voltage difference reading tell me? — The voltage difference reading shows you the gap between your pack's strongest and weakest cells. A well-balanced pack should have a small voltage difference (typically under 0.1V between cells). If you notice the difference is growing larger over time, it indicates your pack is becoming imbalanced and may need rest or maintenance.
• How do I know if my battery pack is still usable? — The Cellmeter helps you make this decision by showing you the total capacity reading and individual cell voltages. If cells are drifting apart in voltage or if the overall capacity has dropped significantly compared to when the pack was new, it may be time to retire the pack. The Cellmeter lets you track this degradation over time.
• Can the Cellmeter tell me how much charge is left in my battery? — The device shows you voltage readings and total capacity information, which gives you a good indication of remaining charge. However, it's not a traditional fuel gauge. The readings tell you the state of the cells and whether the pack is balanced, which helps you understand whether it's safe and efficient to use.
• Does the Cellmeter work with 3S, 4S, 5S and 6S LiPo batteries? — Yes, the Cellmeter supports 2–7 cell configurations, so it works with any standard LiPo pack from 2S through 7S. You can check small 2S packs for micro RC quadcopters right through to large 6S or 7S packs for high-powered RC trucks and helicopters.
• What's the difference between checking pack voltage and individual cell voltage? — Pack voltage is the combined voltage of all cells in series, whilst individual cell voltage shows the state of each cell separately. Individual cell readings are important because a pack can appear healthy at the total voltage level whilst individual cells become imbalanced. The Cellmeter's ability to show both is crucial for proper battery management.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the ETRONIX CELLMETER BATTERY CAPACITY CHECKER ET0501 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.