--- product_id: 251372588 title: "QWORK Battery Monitor Voltmeter Ammeter, Voltage Current Range 8V-80V, 0-100A Voltage Current Meter with 6.5 ft Custom Cable" brand: "qwork" price: "€ 63.56" currency: EUR in_stock: true reviews_count: 13 category: "Qwork" url: https://www.desertcart.hr/products/251372588-qwork-battery-monitor-voltmeter-ammeter-voltage-current-range-8v-80v store_origin: HR region: Croatia --- # 8V-80V voltage range 6.5 ft custom cable for flexible installation 0-100A high precision current detection QWORK Battery Monitor Voltmeter Ammeter, Voltage Current Range 8V-80V, 0-100A Voltage Current Meter with 6.5 ft Custom Cable **Brand:** qwork **Price:** € 63.56 **Availability:** ✅ In Stock ## Summary > 🔋 Stay powered, stay ahead — never get caught off-guard! ## Quick Answers - **What is this?** QWORK Battery Monitor Voltmeter Ammeter, Voltage Current Range 8V-80V, 0-100A Voltage Current Meter with 6.5 ft Custom Cable by qwork - **How much does it cost?** € 63.56 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/251372588-qwork-battery-monitor-voltmeter-ammeter-voltage-current-range-8v-80v) ## Best For - qwork enthusiasts ## Why This Product - Trusted qwork brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Smart Data Retention:** Automatically saves your last test data even after shutdown—never lose track of your battery status. - • **Universal Compatibility:** Perfect for e-bikes, RVs, boats, golf carts, and more—one device to rule all your battery-powered gear. - • **Crystal Clear LCD Display:** Large backlit screen shows voltage, current, consumed power, and battery capacity at a glance. - • **Precision Battery Insights:** Monitor your battery like a fuel gauge with ultra-accurate voltage and current readings. - • **Effortless Setup with Pro-Level Accuracy:** Plug-and-play design with customizable battery specs ensures pinpoint accuracy for every application. ## Overview The QWORK Battery Monitor Voltmeter Ammeter offers a wide voltage range (8V-80V) and high-precision current measurement (0-100A) with a large backlit LCD for real-time battery status. Its 6.5 ft custom cable ensures flexible installation across various vehicles and portable equipment. Designed to automatically save your last test data, it delivers professional-grade accuracy when configured correctly, making it an essential tool for managing battery health in e-bikes, RVs, boats, golf carts, and more. ## Description Product description QWORK Battery Monitor Voltmeter Ammeter with 13 ft Custom Cable Install First, open a round holes of 54.5mm on the panel of the equipment. Then install the coulometer from the front of the panel. Finally tighten the bracket on the back. Product Overviews This is a kind of high precision current type battery capacity tester(also known as coulometer)，which can test the voltage，current and capacity of battery to help users know the state of battery in time. It have memory function. It is suitable for mobile and portable equipments、e-bike、balance cars、cleaning machines、instruments、ups and so on. It is suitable for lithium batteries, lithium iron phosphate batteries, lead-acid batteries and nickel-metal hydride batteries which working voltage is from 8V to 100V. Connect First, series connect the sampler to the negative circuit of your battery. B- of sampler connects to B- of battery. P- of sampler connects to P- of output or C- of charge. Then take a wire of 0.3-0.75 mm².One end of the wire connects to positive of battery，another end connects to B+ of sampler (any one is ok). Finally connect sampler to battery monitor by the shielded wire. After confirm and power on, it will be work normally. Using steps 1. Connect and check the current Power on after complete the connection as shown, the screen should display capacity percentage. If the screen has no response, please check the connection. Then charge or discharge the battery, and check whether the display current is equal to the actual current. If the deviation is large please check the connection. 2.Capacity reset On first use, the percentage and capacity are not the actual value, you should reset the capacity: discharge the battery totally and hold the“V”key for 3 seconds to set the capacity zero or charge the battery fully and hold the “ %”key for 3 seconds to set the capacity full. And it doesn't need to do this again later, except replace the battery. 3.Check and reset the actual capacity If you find the display capacity don't match the actual capacity，please check and reset the actual capacity：discharge the battery totally and hold the“V ”key for 3s to set the capacity zero，then set the capacity value as large as possible. Then charge the battery fully，and the display capacity is the actual capacity. Finally set the display capacity as preset capacity (Please refer to use and setting). Use and setting Attention When charging or discharging，the coulometer must be at work. Otherwise the capacity will not be accurate. When the charge or discharge current is less than backlight off current, coulometer enter a low power state and backlight off. And it can memory the capacity. Because of high sensitivity，when the coulometer is in standby mode (battery has no input or output current)，if it is interfered by electromagnetic radiation (open or close inductive loads，such as the motor) nearly，the backlight will shortly open. When the current changes frequently the date acquisition may produce error，and it will affect the accuracy. The tester cannot be exposed in the sun for a long time or in the environment with large amounts of ultraviolet radiation when using or storing，particular in winter (＜-20℃) and summer (>60℃) otherwise it will shorten the life of LCD. Other description 2. Connect the load，when the discharge current is higher than backlight on current, the backlight on (if backlight blinking，the RS+ and RS- are inversely), and display discharge indicator ,indicate battery is discharging. (Picture 1) Break the load, and connect the charger. When the charge current is higher than backlight on current, backlight blinking (if backlight on，the RS+ and RS- are inversely), and display charge indicator ,indicate battery is charging. (Picture 2) Review: 48v Golf Cart. Works great once you get it setup correctly. - Installed on a EZGO 48V golf cart. Install was pretty straightforward. Drilled hole in dash for meter. Diagram was pretty easy to understand, but the initial setup instructions were a little tough. Looks like they used Google translate from Chinese to English. For those who left negative reviews saying the meter wasn't accurate, im curious if they didn't input the correct specs for their batteries. You have to input how many amp hours your batteries are and what voltage the batteries are considered dead in order for the meter to know when they are dead. The meter is very accurate but only if you input the correct battery specs. For example, my 160amp hour 48V batteries should remain above 42V under load or 46V idle. As soon as the meter registers the batteries are below 42V it will automatically jump the gauge to zero percent charge. Or once 160amp hours have been used it will show zero percent charge. Saw some reviews complaining about this. The next issue I had was after recharging the cart, the gauge wouldn't register that the batteries were charging. Turns out you have to move the Negative charger lead from the battery post, to the "P-" post of the shunt in order for the meter to register the batteries are charging. Review: Works with lithium - Very easy to wire and set up after looking at U tube on programming. Plenty of battery information for such a reasonable price. Highly recommendsmart and accurate ## Features - Battery Condition - High precision Current detection. You can read the battery bank like a fuel gauge, and also clear note the battery status. - LCD displays - Large backlit LCD displays multiple battery information (voltage, current, consumed power and battery capacity) - Data storage - designed to automatically store the last testing data when the system shuts off Voltage Capacity - voltage range 8V-80V and current range 0-100A - Wide Application - It is suitable for mobile and portable equipment, balance cars, cleaning machines,e-bike, instruments, RV, Boat, Caravan etc. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08HWFPGL5 | | Best Sellers Rank | #30,397 in Automotive ( See Top 100 in Automotive ) #9 in Automotive Replacement Amp Meter Gauges | | Brand | QWORK | | Brand Name | QWORK | | Color | Black | | Compatible Devices | Devices with battery banks (8V-80V, 0-100A) | | Customer Reviews | 4.4 out of 5 stars 967 Reviews | | Item Weight | 250 Grams | | Manufacturer | QWORK | | Maximum Operating Voltage | 80 Volts | | Measurement Type | Ammeter, Voltmeter | | Min. Operating Voltage | 8 Volts | | Minimum Operating Voltage | 8 Volts | | Model | WD3941 | | Part Number | WD3941 | | Power Source | Battery Powered | | Style | Voltage | | Style Name | Voltage | | UPC | 792332966894 | ## Product Details - **Brand:** QWORK - **Color:** Black - **Item Weight:** 250 Grams - **Power Source:** Battery Powered - **Style:** Voltage ## Images ![QWORK Battery Monitor Voltmeter Ammeter, Voltage Current Range 8V-80V, 0-100A Voltage Current Meter with 6.5 ft Custom Cable - Image 1](https://m.media-amazon.com/images/I/71drQVfQnsL.jpg) ![QWORK Battery Monitor Voltmeter Ammeter, Voltage Current Range 8V-80V, 0-100A Voltage Current Meter with 6.5 ft Custom Cable - Image 2](https://m.media-amazon.com/images/I/61JJnrYQnbL.jpg) ![QWORK Battery Monitor Voltmeter Ammeter, Voltage Current Range 8V-80V, 0-100A Voltage Current Meter with 6.5 ft Custom Cable - Image 3](https://m.media-amazon.com/images/I/61vvdVoaG1L.jpg) ![QWORK Battery Monitor Voltmeter Ammeter, Voltage Current Range 8V-80V, 0-100A Voltage Current Meter with 6.5 ft Custom Cable - Image 4](https://m.media-amazon.com/images/I/71a5ThB13pL.jpg) ![QWORK Battery Monitor Voltmeter Ammeter, Voltage Current Range 8V-80V, 0-100A Voltage Current Meter with 6.5 ft Custom Cable - Image 5](https://m.media-amazon.com/images/I/81DpcoCDptL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Can the flashing screen be turned off when charging?** A: Long press the left and right keys at the same time. **Q: Unit appears to go to sleep mode, meaning there is no display at all with voltage applied. button press turns on the device then works ok. Fix for it?** A: When the battery is neither charging or discharging the screen turns off. When not connected to the grid, which is the usual case with me, generally the screen will go dark around sunset or sunrise when the demands from my RV equal the power produced by my solar panels. When connected to the grid and my battery disconnected from the RV, the screen will be dark half the time. It lights up when my Morningstar charger decides my battery needs a modest "topping off." It should be noted that the screen goes dark even when the charger is in float mode, the current being so modest as to be almost undectable. **Q: Does it display 1/10, 1/100 or 1/1000 of a volt?** A: 1/100. **Q: how long has anyone extended their display cable** A: I added 15ft to my original 13ft cable using CAT5 cable - just cut the existing cable in half and soldered the CAT5 in the middle. The original cable has a shield wire that connects to one of the pins; my CAT5 cable didn't have a shield but I combined the four white wires in the CAT5 and used that combined wire to connect to the shield wire. That left 4 wires in the CAT5 to connect to the remaining 4 wires of the original cable. The result worked fine. ## Customer Reviews ### ⭐⭐⭐⭐⭐ 48v Golf Cart. Works great once you get it setup correctly. *by B***N on August 16, 2024* Installed on a EZGO 48V golf cart. Install was pretty straightforward. Drilled hole in dash for meter. Diagram was pretty easy to understand, but the initial setup instructions were a little tough. Looks like they used Google translate from Chinese to English. For those who left negative reviews saying the meter wasn't accurate, im curious if they didn't input the correct specs for their batteries. You have to input how many amp hours your batteries are and what voltage the batteries are considered dead in order for the meter to know when they are dead. The meter is very accurate but only if you input the correct battery specs. For example, my 160amp hour 48V batteries should remain above 42V under load or 46V idle. As soon as the meter registers the batteries are below 42V it will automatically jump the gauge to zero percent charge. Or once 160amp hours have been used it will show zero percent charge. Saw some reviews complaining about this. The next issue I had was after recharging the cart, the gauge wouldn't register that the batteries were charging. Turns out you have to move the Negative charger lead from the battery post, to the "P-" post of the shunt in order for the meter to register the batteries are charging. ### ⭐⭐⭐⭐⭐ Works with lithium *by D***S on November 6, 2025* Very easy to wire and set up after looking at U tube on programming. Plenty of battery information for such a reasonable price. Highly recommendsmart and accurate ### ⭐⭐⭐⭐⭐ Works well with my RV setup *by R***A on November 26, 2022* Purchased this for my travel trailer to have an accurate estimate of Ampere time 200ah lithium battery percentage. I needed the longer 13' cable because the battery and shunt are inside an exterior weatherproof battery box. Shunt appeared to be of a good quality material. Mounting the readout display inside my trailer was fairly easy by following existing conduit path inside the trailer. Reading the small text included with the mini-manual was difficult and needed to read the instructions a couple of times to get everything dialed in. I followed the instructions in the manual and depleted the battery (using a device similar to "MakerHawk Electronic Load Tester") to set my 0% baseline. I do this will all my new lithium batteries to make sure I'm not getting ripped off. I noticed a lot of youtube videos chose the alternate method easier method of setting up the display unit by charging the battery until full then setting the device to 100%, but I chose not to go that route because I wanted to make sure where my 0% would be so that I wouldn't be stuck with a dead battery while out boon-docking in my travel trailer. Now I feel confident that I can use the trailer to a low percentage without worry. I attached the mini-manual for those interested in seeing what is required to set this up. All in all, I'm very happy with this device and would recommend this to anyone in search of a cost effective battery shunt to estimate battery %. ## Frequently Bought Together - QWORK Battery Monitor Voltmeter Ammeter, Voltage Current Range 8V-80V, 0-100A Voltage Current Meter with 6.5 ft Custom Cable - EZGO RXV&TXT Smart Charger - 48V 13A and 36V 18A Trickle Battery Charger, Delta-Q 3-Pin, Lithium, LiFePO4, Lead-Acid AGM/Gel/SLA - LiTime 12V 100Ah LiFePO4 Battery BCI Group 31 Lithium Battery Built-in 100A BMS, Up to 15000 Deep Cycles, Perfect for RV, Marine, Home Energy Storage（4 Packs） --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/251372588-qwork-battery-monitor-voltmeter-ammeter-voltage-current-range-8v-80v](https://www.desertcart.hr/products/251372588-qwork-battery-monitor-voltmeter-ammeter-voltage-current-range-8v-80v) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-06-04*