# EV Battery Diagnostics by CS > Offline EV battery diagnostics, service tools, DTC library & technician guide Canonical page: [https://chrome-stats.com/d/com.chatstick.evbatterydiagnostics](https://chrome-stats.com/d/com.chatstick.evbatterydiagnostics) ## Overview - **ID:** `com.chatstick.evbatterydiagnostics` - **Platform:** Android - **Type:** Android app - **Status:** Available - **Publisher:** ChatStick Co., Ltd. - **Category:** BOOKS\_AND\_REFERENCE - **Version:** 1.0 - **Last updated:** 2026-06-27 - **First published:** 2026-06-27 - **Publisher country:** TH - **Size:** 50 MB - **Data as of:** 2026-09-13 - **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.chatstick.evbatterydiagnostics) - **Website:** [https://www.chatstickmarket.com/](https://www.chatstickmarket.com/) - **Privacy policy:** [https://www.chatstickmarket.com/privacy-policy](https://www.chatstickmarket.com/privacy-policy) ## Description EV Battery Diagnostics is a practical, fully offline service toolkit and technician handbook for automotive technicians, students, EV specialists, fleet teams, and serious learners who want a structured way to understand and service high-voltage battery systems.

The interactive tools, service records, quizzes, and guided diagnostics are the core of the app — and the complete EV Battery Diagnostics & Maintenance Handbook is included as a bonus reference. Everything works without an internet connection. No account, no ads, no subscriptions.

WHAT YOU CAN DO

• Diagnose with confidence — guided decision-tree flowcharts for reduced range, slow DC charging, insulation faults, and cell imbalance walk you to a likely cause and recommended action.
• Look up fault codes — a searchable DTC reference library with likely causes and links to the related handbook chapter.
• Run the numbers — eight technician calculators: State of Health, Cell Balance Analyzer, Range Estimator, Charging Time & Cost, HV Safety Timer, Degradation Projector, Insulation Resistance, and Pack Configuration. Metric or imperial.
• Keep service records — add vehicles (NMC, LFP, or solid-state), log sessions with mileage, SOH, capacity, and cell spread, watch the SOH-vs-mileage trend chart against a 70% threshold, and export a PDF service report.
• Work the procedure — a four-phase service checklist (safety & preparation, data collection, capacity & balance evaluation, service & disposition) that saves your progress.
• Prove your knowledge — per-chapter quizzes, a 20-question certification exam with a shareable completion certificate, missed-question review, a glossary, and quick-reference cards.
• Read the full handbook — twelve offline chapters with images, bookmarks, personal notes, adjustable text size, resume-where-you-left-off, and full-text search.
• Stay sharp — a home-screen widget rotates daily EV battery service tips, plus an optional daily learning reminder.

BUILT FOR THE BENCH

• 100% offline — all content ships inside the app.
• Light and dark themes, adjustable text size, metric/imperial units, and haptics.
• Phone and tablet layouts.
• Your data — progress, notes, vehicle records, quiz and exam history — stays on your device.

This app is a learning and workflow aid. It does not replace OEM service information, certified high-voltage training, shop safety rules, or vehicle-specific repair procedures. Always follow manufacturer documentation and applicable safety regulations before working on any high-voltage system.

© ChatStick Company Limited ## Rankings - #3,152,027 — Overall ## Permissions and access ### Permissions - `android.permission.ACCESS_NETWORK_STATE` - `android.permission.FOREGROUND_SERVICE` - `android.permission.POST_NOTIFICATIONS` - `android.permission.RECEIVE_BOOT_COMPLETED` - `android.permission.VIBRATE` - `android.permission.WAKE_LOCK` - `com.android.vending.CHECK_LICENSE` - `com.chatstick.evbatterydiagnostics.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION` ## Similar extensions and apps - [EV Maintenance for Owners App](https://chrome-stats.com/d/com.chatstick.evmaintenanceforowners) - [EV Diagnostic](https://chrome-stats.com/d/com.evdiag.app) — 286 users - [EV Doctor™](https://chrome-stats.com/d/appinventor.ai_evegalabs.EV_Doctor_proD_3_0) — 69 users - [EV Survival Guide by ChatStick](https://chrome-stats.com/d/com.chatstick.theevsurvivalguidead) - [EV DOCTOR™](https://chrome-stats.com/d/com.batteryok.evdoctor) — 288 users - [My Battery Health](https://chrome-stats.com/d/fr.arrows.mybatteryhealh) — 7,259 users - [B-Selcheck](https://chrome-stats.com/d/com.lges.bcu) — 33 users - [EVcheck](https://chrome-stats.com/d/com.betterwhy.evmobile) — 2,379 users - [EVOA - OBD2 EV Battery Scanner](https://chrome-stats.com/d/com.nmotion.evoa.android) — 9,719 users - [EV\_Health](https://chrome-stats.com/d/com.app.ev_health) — 57 users - [Battery Diagnostics and Health](https://chrome-stats.com/d/com.appleenergy.exidediagnostic1) — 1,284 users - [EV Clinic](https://chrome-stats.com/d/com.infotonics.evclinic) — 15 users --- Source: [Chrome-Stats](https://chrome-stats.com/d/com.chatstick.evbatterydiagnostics)