Smart Lock Battery Life Calculator
Tell us your unlocks per day, the connectivity mode and battery type — and see roughly how many months between charges or replacements. Always-on Wi-Fi drains far faster than BLE. Indicative only.
Your lock
Features
Bluetooth wakes only when your phone is near — the gentlest on batteries. Common, cheap, disposable. Capacity drops in cold; voltage sags near the end. Estimated daily draw ≈ 18.7 mAh from 1,716 mAh usable capacity. Indicative India 2026 — real life varies with firmware, signal and temperature.
Estimated time between replacements
0.0 mo
≈ 92 days · 18.7 mAh/day draw · disposable cells
Months
3 mo
Days
92 d
between charges
Low-battery warning
~14 d
lead time before flat
- Idle / radio2.5 mAh
- Lock cycles14.4 mAh
- Auto-lock0.6 mAh
- Keypad1.2 mAh
Daily drain contribution. Indicative — verify against your lock's spec.
Battery months by connectivity mode
Same unlocks/day, battery and features — only the connectivity changes. Always-on Wi-Fi is dramatically thirstier than BLE. Your selected mode is highlighted.
Tips to stretch battery life
- Prefer BLE + a plugged-in hub over an in-lock Wi-Fi radio for remote access — the heavy drain moves to mains power.
- Use lithium cells in hot/cold spots — they hold voltage better than alkaline and last longer.
- Keep a spare set of cells (or a charged pack) at home so a low-battery alert never locks you out.
- Reduce keypad backlight brightness and auto-lock polling frequency in the app if your lock allows it.
- Mount the lock within strong signal range of the hub/router — a weak radio retries constantly and drains faster.
- Most locks warn at ~15% — act within the ~14-day window, and always keep the physical key / external USB jump handy.
Pick the right smart lock for your door
DesignAI matches the lock, connectivity and power setup to your door, traffic and Indian climate — and flags the power-backup details that matter on egress doors.
Assumptions & the honest caveat
This tool is indicative only. It models an average daily current draw (idle radio + lock-cycle pulses + optional features) against a derated usable capacity (78% of nameplate, to account for self-discharge, end-of-life voltage cut-off and India's heat). Real battery life depends heavily on firmware, signal strength, temperature and how your specific lock is configured — treat the result as a ballpark, not a guarantee. Always check the manufacturer's rated battery life and keep a backup (physical key or external power jump). For access-controlled doors on an escape route, batteries are not a substitute for NBC-compliant free egress, fire-alarm release and power backup — confirm the wiring with a security integrator or licensed electrician, and isolate power before any work. No hardware purchase is implied; this is a free planning aid, not a quote (any product prices you see elsewhere include 18% GST).
Related Guides — Deep-dive reading
Smart Lock Battery Guide: Life, Types & Backup India 2026
How long smart-lock batteries really last in India, what drains them, low-battery warnings, and how to never get locked out when they die.
Home Doors & EntrancesSmart Lock Wi-Fi Connectivity in India 2026: BLE, Matter
How smart locks actually talk to your phone and the cloud, why most use Bluetooth plus a hub, and how to future-proof with Matter.
Home Doors & EntrancesWiFi Smart Lock for Indian Homes: App Control, E-Keys & Connectivity Guide (2026)
How WiFi smart locks let you lock, unlock and grant access from your phone - hub vs built-in WiFi vs Bluetooth, e-keys for maids and deliveries, geofencing, voice control, and the Indian power-and-network caveats nobody warns you about.
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