Complete Security Guide: Milenco Sleep Safe Alarm Replacement Batteries Pack 18 Review

The Milenco Sleep Safe Alarm Replacement Batteries are designed for use with Milenco Sleep Safe Alarms, and come in a pack of 18 — enough to keep a Sleep Safe Alarm running for a good stretch without needing to search for spares mid-trip.

Battery life

Milenco states the battery will last for more than 1,000 hours, which works out at roughly 120 nights of protection while you sleep. That gives a reasonable guide for when to check or plan a replacement, particularly before a longer tour where you won't want the alarm to fail partway through.

Why keep spares

Because a Sleep Safe Alarm is only useful if it's actually working, having a pack of replacement batteries on hand means you're not caught out mid-season, especially if you're away from home and can't easily pick up the right battery type locally.