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
Wi-Fi vs Bluetooth Smart Lock (2026): Which Connection Suits Your Home in India
How a smart lock talks to your phone decides almost everything about how it feels to live with. This even-handed head-to-head compares Bluetooth (short-range, local, long battery) and Wi-Fi (control from anywhere, alerts, faster drain) — and explains why the common sweet spot in India is a Bluetooth lock with a Wi-Fi bridge.
SecurityInstalling a Smart Lock in India: Step-by-Step for Indian Doors
How to fit a smart lock on a real Indian door — checking thickness, handing, and whether you have a mortise, rim or deadbolt fitting; removing the old lock; mounting the plate and spindle; loading batteries; pairing to the app or hub; setting PINs and fingerprints; testing and troubleshooting misalignment, battery and connectivity — with the backup key that must always work.
Smart HomeSmart 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 & EntrancesRelated Tools — You may also find these useful
Access Control Cost Estimator
Estimate per-door and whole-building access-control cost in India, with the full component breakdown and GST.
Cost EstimatorAccess Control ROI Calculator
Compare automated access control against guard and manual costs to find the saving and payback.
ROI CalculatorAccess Control System Designer
Design a door access-control system for your building and get the component BOM, topology and indicative cost.
System Designer