![]() This is also a common battery powering your key fob, your remote control, and it may well be on the motherboard of your computer. This battery powers your Garmin Cadence Sensor, and is in the heart rate monitors made by Polar, Garmin and Wahoo Fitness. It's also used by FSA in its electronic road shifters. This is the battery used in many electronic road shifters, including the SRAM AXS road shifters, and it's the battery in SRAM’s Eagle AXS and GX Eagle AXS controllers. This CR2032 battery powers your SRAM Blip Box. As for my sport usage, I have this battery in my Zipp Vuka Shift AXS 90 wireless shifter extensions and, of course, in my Quarq and Stages power meters. You have CR2032 batteries for all kinds of things, and most folks can’t name half of them. It’s the most common coin or button cell battery in use today, and not just for bikes. The C announces the chemistry of the battery, which is lithium (as opposed to alkaline, silver, mercury, zinc). This battery’s nomenclature works as follows: 2032 means its 20mm in diameter and 3.2mm in depth. It was the same battery I needed in both power meters: a CR2032. In the image above is where the battery goes in my Quarq power meter, and the image below that is what the rest of that process looks like: The battery is fixed by the battery cap (which screws on by hand), and a cosmetic cap (no tools to change this battery). The battery in my Quarq power meter went dead (after 2 years of use). My head unit was not waxing sarcastic at my lack of power, and there wasn’t anything wrong with my head unit. Also last week my Wahoo ROAM head unit displayed N/A where the power displays. I popped in a pair of new CR2032 batteries (one on each crankarm) and, presto, my avatar chose to join the ride. After 6 months with this smart bike, the coin cell batteries in the Stages Power Meter (part of the Stages Bike), went dead. After troubleshooting my Zwift account (had I failed to pay?), and my Windows gaming rig (the same thing happened when I logged in with an AppleTV), it finally dawned on me. Remember to watch those units.My Stages SB20 Smart Bike paired with Zwift just fine, but when I pedaled my Zwift avatar just stood there. Battery lifetime and lifetime of other components? Posted on Tue 13th, December 2016 īy knowing the draw or current drain and dividing that into the ampacity of the battery will provide the number of hours we will be able to run in that continuous mode. See: Puck using NRF.sleep() in ver 1v92+ This will be improved by using a polling effect or placing the unused chip sections into sleep mode. It can be seen that executing many continuous Javascript instructions will shorten the battery life considerably. Note that at idle battery internal resistance will drain before this limit is metĪt idle: 240,000 / 3 = 80,000 / 8760 = 9 yrīluetooth: 240,000 / 200 = 1,200 / 24 = 50 dy Lets convert these current drains to hours of operation: Simply divide the battery capacity by the current drain required of the circuit. We’ll just use a couple of the listed limits:Īll three LEDs lit, 100% CPU usage running JavaScript – 10mA Under the heading ‘Power Consumption’ is a nice table we may use to determine the battery life expectancy. Now that we have some baseline data, we can relate this to how an Espruino Puck will perform. With that constant drain we can expect the battery to last seven weeks. This battery will provide a continuous supply of 190 micro-Amps for 1263 hours at room temperature. What does this all mean? We have a 3.0 volt battery that has a capacity of 240 milli-Amp hours of charge. We also can visually see this data laid out on a graph on the left hand side: The common CR2032 watch battery is the appropriate power supply choice as it’s physical size mimics the footprint of the Puck itself. With that choice brings with it some physical limits.īatteries are rated on their capacity and their performance detail may be obtained from the manufacturer specification data sheet. The Puck is designed to be a self contained IoT device running on its own power in the smallest space possible. While there are many factors that can affect how long an Espruino Puck battery will last, we are able to determine some basic limits with some simple math.
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