EV Battery Guide vs RayStatus | Phone Diagnostics

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.

RayStatus turns the device information iOS actually makes available into clear status cards. Check battery, storage, memory, network, display, audio, and thermal state in one place. If iOS does not expose a value, RayStatus says so instead of filling the gap with an estimate. DEVICE STATUS AT A GLANCE • Check battery level, available storage, memory, network interfaces, data usage, and system details • See the four thermal states published by iOS without presenting them as temperatures • Enable only the cards you need and arrange them in your preferred order • Refresh manually or use Live Monitor to watch short-term changes TRACK BATTERY HEALTH • Import maximum capacity and cycle count from iPhone Analytics Data • Files are parsed entirely on your device and only the useful battery fields are retained • You can also enter the figures shown under Battery Health & Charging manually • Build a local history to understand capacity changes, charging habits, and trends HOME SCREEN AND LOCK SCREEN WIDGETS • Single-reading, battery, four-reading, and eight-reading layouts • Home Screen and Lock Screen families • Capture times and a refresh button make data age clear • iOS schedules background widget updates; no app or paid plan can guarantee continuous refreshes HONEST ABOUT iOS LIMITS iOS does not let third-party apps directly read CPU or battery temperature, system-wide CPU usage, cellular signal strength, or ambient humidity. RayStatus explains these limits instead of showing plausible-looking guesses. YOUR DATA STAYS ON YOUR DEVICE • No sign-up and no RayStatus account • Device readings, preferences, and imported battery-health records are stored locally • Analytics files are never uploaded, and RayStatus has no developer-operated server • The free tier includes ads; RayStatus Pro removes them RAYSTATUS PRO The free version includes every live status reading, card ordering, and the single-reading and battery widgets. RayStatus Pro is available only as a monthly or yearly subscription. There is no lifetime purchase. An active subscription unlocks: • No ads • Unlimited history • Charging behavior analysis and battery-health trends • Every widget size and multi-reading overview • Charging Live Activity • CSV export Subscriptions renew automatically and can be managed or cancelled in your Apple Account. After cancellation, Pro remains active until the end of the current billing period. Current pricing is shown by the App Store purchase confirmation. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://israynotarray.dev/app/raystatus-privacy.html