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AGM

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Frequently Asked Battery Questions

What is an AGM Battery?

An AGM battery is a type of sealed lead-acid battery where the electrolyte is absorbed into a fiberglass mat (AGM = Absorbent Glass Mat). That design holds the acid in place, which makes AGM batteries spill-resistant, low-maintenance, and highly vibration-resistant—a big reason they’re common in modern vehicles, marine, RV, powersports, and backup power applications.

How long AGM batteries last depends on heat, charging system health, and how deeply they’re discharged. In typical automotive use, many AGM batteries land in the 3–6 year range.

What are non spillable batteries?

A non spillable battery is a sealed battery designed so the electrolyte won’t leak or spill under normal use and typical handling.

Why people choose non-spillable AGM batteries

Leak-resistant design for cleaner installs and fewer mess-related failures
Maintenance-free (no topping up fluids)
Often a strong match for start-stop vehicles and higher electrical loads (depending on the application)

If you’re unsure which AGM group size fits your vehicle, the fastest path is to select an AGM product on this page and compare the group size/code (ex: L4/H7/94R) and specs—then contact GNB for a fitment check.

Are non spillable batteries hazardous?

In day-to-day use: a non spillable AGM battery is generally safe to handle when intact, but it still contains lead and acidic electrolyte internally, so it should be treated with care (avoid tipping, cracking the case, or shorting terminals).

In transport/shipping terms: batteries can be regulated as dangerous goods depending on the type and how they’re shipped. Transport Canada notes that some batteries are regulated under the TDG framework due to the hazards they can pose.
However, many “non-spillable” wet batteries that meet specific testing/requirements may be excepted from certain regulations under some carrier/transport rules (requirements vary by mode and carrier).

Best practice for customers: regardless of “non spillable” labeling, don’t throw them in the trash. Recycle automotive batteries through a proper program (like GNB’s) to keep hazardous materials out of landfill streams.

What is your warranty for AGM batteries?

GNB’s warranty for Automotive SLA/AGM batteries is 2 years (24 months).

How a warranty claim works (important details)

Bring or ship the battery to GNB’s Hamilton warehouse with the original receipt.
GNB will test voltage and, if needed, perform a load test (and may charge/retest over 2–3 days).
If the battery fails the load test, a replacement is provided; if it passes, it’s returned.
Replacement coverage is based on the original purchase date, not the replacement date.