EV Battery Guide vs DatumLab

EV Battery Guide is an independent educational tool for EV owners — built to help you actually understand the battery in your car. What's inside: • Open-Circuit Voltage (OCV) vs SOC curves — see your battery's true voltage behavior • DC fast-charging power curves — understand the CC→CV transition and why it slows down • BMS buffer visualization — your "100%" isn't really 100% • Capacity retention prediction — how much will be left in 5 or 10 years? • Cycle life vs depth-of-discharge — why shallow cycling lasts longer • Lithium plating risk heatmap — what to watch out for in cold weather • Winter range loss waterfall — where exactly does the range go? • Speed × temperature energy matrix — the dual cost of highway and cold • Cost-per-mile comparison — home charging, fast charging, and gas • 13 interactive professional charts — built on public cell datasets Coverage: 65 popular EV configurations across 7 distinct cell chemistries (LFP / NCA 2170 / NCA 18650 / 4680 / NMC / LiCoO₂), with chemistry-specific recommendations for each. Three languages: Full support for English, 中文, and 日本語. Switch anytime in-app. Privacy first: • No accounts, no email • No user data collection • No third-party analytics or ad SDKs • Your selected vehicle and language preference live only on this device Completely free: No subscriptions, no in-app purchases, no ads. All features are open from day one. Disclaimer: This app is not affiliated with any vehicle manufacturer. Vehicle model names are used solely to describe battery chemistry, parameters, and charging characteristics — a nominative fair use. All data is sourced from public cell data sheets, EPA filings, and peer-reviewed research.

DatumLab is a practical mechanical toolbox for machinists, CNC operators, mechanical designers, and shop-floor technicians. Use it to look up common thread data, calculate ISO fits, estimate speed and feed values, convert shop units, check material references, and save frequently used setups. Core tools work offline, so you can keep working at the machine, in the workshop, or during design review without depending on a network connection. Key tools: Thread calculator for metric, UNC, UNF, BSP, NPT, trapezoidal, and Heli-Coil references Tap drill, clearance hole, pitch, pitch diameter, and minor diameter lookup ISO tolerance and fit calculator for common hole and shaft zones Speed and feed calculations for milling, drilling, tapping, and turning Radial chip thinning and thread turning helpers Unit conversion for length, pressure, torque, speed, force, and mass Material references for common aluminum, steel, stainless, non-ferrous, and plastic materials Weight, bolt preload, and geometry helpers Favorites, recent calculations, custom tools, custom materials, and exportable reports DatumLab is designed for quick reference and setup planning. Values are reference starting points only. Always verify final machining parameters with your tool, machine, workholding, material, and supplier recommendations.