A battery malfunction is the most likely cause of the Totara Terrace fire last week, a Fire and Emergency NZ (FENZ) risk management officer has found.

A family home on Totara Terrace was destroyed, and a neighbouring house, owned by another member of the family, was severely damaged in the fire early in the morning on Otago Anniversary Day (Monday March 22).

Fortunately all the occupants, including at least six children, made it out quickly and safely, but the families’ belongings were destroyed.

FENZ Central/North Otago Area fire risk management officer John Smalls told the Wanaka App the most likely cause of the blaze has been determined to be a lithium ion battery malfunction. 

“At this stage I am not able to determine exactly what the malfunction was but most probably it was overcharged at the time of the fire,” he said. 

The battery was found in a lean-to attached to the garage of the rear house. John said the battery explosion would have set fire to plastics around it.

He said it was common for people to leave batteries (of cell phone or battery powered tools) to charge overnight.  

FENZ recommends people use timers if charging batteries overnight. PHOTO: Supplied

“Unfortunately while this may usually be a safe practice the risk is always present that overcharging can occur and lead to an explosion, particularly if the battery has been dropped or otherwise damaged as is common with items such as drills on jobsites. 

“I would suggest if you leave batteries on to charge overnight to use timers on the chargers to ensure they are not left charging once fully charged.”

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John also recommended that all bedrooms and common areas be fitted with smoke detectors, and home owners should consider devices such as heat detectors (available from the same stores where smoke detectors can be found) in high dust or fume areas such as garages or kitchens. 

“This gives the earliest warning of a fire in your home which can become unsurvivable in as little as three minutes,” he said.

John also advised people to “never assume 111 has been called”.

“Immediately you and your family are safe please call 111 even if others have stated they have already called, this goes for neighbours or passers-by. The earliest activation of the brigade gives us the best chance of saving your home. Even if the entire house suffers fire damage then at least those items that you hold dear may be saved,” he said.

This link demonstrates the speed of fire and shows how to develop a home escape plan. It includes an interactive 360 degree video that shows a fire developing in real time inside a burning house.

Find tips on all aspects of fire safety, including rural living and businesses, here.