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DON'T CHARGE YOUR PHONE OVERNIGHT, WARNS BATTERY EXPERT

 * 09/08/2023
 * RNZ
 * 

Devices like phones shouldn't be left charged unattended overnight, an Auckland
battery expert says. Photo credit: Getty Images

A recent e-scooter battery explosion is a reminder that batteries should be
treated with respect, an Auckland battery expert says.


Late last month, a charging scooter battery exploded in a central Wellington
apartment, leaving one person in a critical condition. The force from the
explosion was enough to crack the glass and move furniture. In the US, the
United States Federal Aviation Administration (FAA) has warned passengers not to
fully charge devices and phones when taking them on flights due to increased
fire risk.

Neither event is a surprise to Peter Simpson, director of Simpower Battery
Specialists.


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"When you work with batteries long enough, you develop a respect for them," he
told Nights.

"Batteries store large amounts of energy in a very small space. And, if you're
storing that kind of potential, it's got to go somewhere."

While any kind of battery can be problematic, the increasing prevalence of
lithium ion batteries – used in everything from E-vehicles to phones and laptops
– means it's come to the fore in recent years. People need to remember to take
care with these batteries and be mindful of their power, Simpson says.

As a general rule, he doesn't leave any batteries charging overnight because
"things can go wrong". That includes phones, iPads or tablet devices.

"You can have a component failure. You can have all sorts of things happen. Of
course, if you're leaving something unattended overnight, it doesn't take long
for it to develop and turn into fire.

"Particularly with lithium ion and things like that, you can get a phenomenon
known as thermal runaway, which is where the cell hits a certain temperature.
And at that particular temperature point, the cells around it go, and it can't
be stopped. And so you get rupturing or fire of the case. In that case, the cell
will continue to burn until it's finished."



When it comes to taking a fully charged device on a plane, Simpson says the
rules are confusing.

"The shipping guidelines say that, if you're shipping lithium ion batteries
under the UN certification or shipping code of UN3480, the battery must not be
in a state of more than 30 percent of charge. And that's the goal on a cargo
aircraft. So suddenly, we take them on a plane at 100 percent charge, but it's
not okay to ship them 100 percent charge on a cargo aircraft.



"The latest sort of information I've seen suggests that, potentially when the
battery's 100 percent fully charged, that the different pressure at altitude
could potentially have an impact on the battery. But, invariably, often the
devices are not fully charged anyways.

"I've travelled with my phone at 100 percent charge, as I'm sure most people
have."

Sim says there are "plenty" of counterfeit batteries on sale here. He believes
there should be more control over who sells lithium batteries so consumers know
that what they're buying is safe. Internationally, e-commerce giants eBay and
Amazon have banned the sale of 18 650s, a type of lithium ion cell, but no such
restrictions exist in New Zealand.

"From what I've seen in the market, you can buy unprotected lithium ion cells
from places such as TradeMe and Facebook marketplace, and so on and so forth.
There's no sort of certification with that. There's no kind of quality control
checks. It's just a suggestion that, yes, this is a genuine product."


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HOW TO KEEP BATTERIES SAFE

Don't short the battery out: "Don't cause short circuits. Don't put the positive
and negative together, because that's the quickest way to essentially short the
battery and cause a fire."

Don't heat up the battery: "Think about yourself, you like to be at room
temperature, the battery likes to be at room temperature. If it's getting
increasingly hot for you, the battery doesn't like that and potentially you can
cause a rupture or or fire again.

Don't abuse the battery: "Don't disassemble or deform them or treat them
roughly. They can become deformed by the pressure or an impact, and that might
cause the internal separator puncture and that can cause an internal short
circuit."

Don't mix them up: "Don't mix different types of batteries together. That's
another big no-no. That can cause big problems."

Don't overcharge the battery: "Always try to match the charger to the battery.
Generally, as a rule you're best to use the original one because it was designed
to charge that battery."

RNZ

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