Silent accelerated battery test

The silent accelerated battery test is the battery test method that the 2019 edition of CAN/ULC-S536 introduced, replacing the older practice of putting a meter across the terminals and writing down the reading. Canadian trade and fire service sources describe the change as requiring functional or load testing with recorded results rather than a basic voltage check. It bites in Ontario now because the Fire Code designates S536-2019, in force since 1 January 2026, so it is the method behind the annual battery test on Ontario buildings. The procedure itself sits inside a paywalled standard we have not read, so what follows is what is publicly attested plus what the Fire Code requires you to record.

Last updated: September 2026

What it replaced, and why

The old habit was to put a meter across the battery terminals, read something in the high twenties, and move on. That measures the charger holding the batteries up. It does not measure capacity.

A sealed lead acid battery with high internal resistance will show a perfectly healthy terminal voltage at rest and collapse the moment it is asked for alarm current, which is the only moment that matters. Terminal voltage at rest is not evidence that the battery will carry the system through the supervisory period and then the alarm period at full load.

What is publicly attested

The 2019 edition of CAN/ULC-S536 introduced a silent accelerated battery test method in place of the meter based approach. That attribution comes from Rotaflow, a Canadian fire protection company writing about the changes to the standard, and it is corroborated in substance by the Ontario Association of Fire Chiefs and by REMI Network, both of which describe battery testing under the updated requirements as going beyond basic voltage checks to include functional or load testing with recorded results.

What we cannot tell you

S536 is copyrighted and paywalled. We have not read it and we will not reconstruct it from an unlicensed copy. So, plainly:

Attested. The 2019 edition introduced a method of this name, it replaced a meter based approach, and the expectation is a functional or load test with the result written down.
Not attested in any free source we found. The procedure itself, the equipment it requires, the pass criteria, and what specifically "silent" and "accelerated" refer to in the method.

That gap is not an invitation to guess. If your work turns on the procedure, you need the standard itself, or your employer's documented procedure written from it.

Where the Ontario duty comes from

Fire Code Article 6.3.2.2 requires a fire alarm system to be inspected and tested in conformance with CAN/ULC-S536, and Fire Code Division B Table 1.2.1.A designates S536-2019. The article itself sets no frequency; the intervals live in the standard.

The recording duties are in the same article and are free to read on e-Laws. Sentence (4) requires a record of each device, component and circuit stating whether it is in proper working order. Records are retained under Article 1.1.2.2 for at least two years, and so that at least the most recent and the one before it are kept. For compliance purposes, an unrecorded test is a test that did not happen.

Who may do the work is Division C Article 1.2.1.2: a person who has completed a program or course acceptable to the Fire Marshal.

What goes wrong

Still reaching for the meter. Writing down a terminal voltage is the most common way this requirement is missed, and an inspector can see it on the report without going near the building.

Testing the main panel only. Every transponder and remote booster with its own battery set needs its own test, the same way it needs its own calculation.

A battery that met the calculation on day one and has not been load tested since. That is a deficiency waiting to be written up, and batteries age whether or not anyone looks at them.

Doing the test properly and not recording the result.

Neighbouring terms

Sizing the batteries in the first place is the battery calculation. How long they have to last is standby power, and that duration comes from the building code rather than from a ULC standard. This test is one item inside the annual testing regime, and the rest of what the 2019 edition changed, including the mandatory report format, is in the Ontario Fire Code changes that took effect in 2026.

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