Authorities are warning people to be extra careful this festive season with gifts containing lithium-ion batteries.
It comes as a house burnt down on Saturday at Cooks Beach in the Coromandel, which was reportedly caused by an electric car.
Locals say the car caught fire while charging in the garage.
The risk of lithium-ion batteries is something Malcolm Lee-Guard is far too aware of after his electric bike exploded and caught fire.
"[I] opened the door, the place was just full of smoke. I could not see these cars in front of me," Lee-Guard told Newshub.
Luckily, his fire extinguisher was right by the door, otherwise the entire house would have gone up in flames, he said.
"If you want to save your house… Because this would have been the house, the cars, the contents if I hadn't put it out."
The same thing happened in Australia last year, when an e-bike exploded while it was charging in a Sydney hostel room.
It's a risk that Fire and Emergency NZ (FENZ) is really worried about.
"The big concern this holiday season is around lithium batteries," said Peter Gallagher, risk reduction manager at FENZ.
Be careful when you're giving away battery-powered gifts this Christmas - keep the instruction manual, and always have an adult responsible for putting it on and off charge.
That applies to everything from scooters, to cordless drills.
"Things like making sure you use the correct charger for that device, making sure you don't overcharge it, and don't charge in direct sunlight," Gallagher told Newshub.
"And when it is fully charged, turning it off so it's not overcharging that battery."
Another concern is people not checking for smoke alarms in holiday accommodation.
"When you're asleep, you can't smell smoke so the only thing that'll wake you up is hearing the alarm going off," Gallagher said.
And to prevent scenes like the huge bushfire in Waitaha/Canterbury started by fireworks, authorities are urging extra care during the high-risk conditions expected this summer.
"Fireworks are a recipe for disaster in high winds," said Gallagher.
"The appeal here is that people think about our volunteer firefighters in particular and let them have time over Christmas with their friends and family."
Rather than putting their lives at risk battling a blaze caused by careless Kiwis.
