If you've got kids then you will need the staple accessory of every home on Christmas Day - batteries.
While they are as essential to most toys as stuffing is to turkey - a lot of the time, us parents can forget all about them and an annual Christmas eve dash to the nearest petrol station happens.
But battery manufactures are warning parents against a popular - but dangerous battery trick that, if we are honest, we've all tried.
Duracell say parents should avoid mixing new batteries with old in the same device this Christmas.
The energy experts say that mixing old and new batteries can cause them to rupture and spill harmful chemicals which can break the device or be harmful to pets and people.
On the Duracell website the warning says: "Do not mix old and new batteries. Doing so will reduce overall performance and may cause battery leakage or rupture.
"We do recommend changing all batteries in a unit at the same time. A partially used battery will drain energy from a new one, reducing the total amount of battery power available."
It also says you should never mix battery brands or lithium batteries with alkaline batteries because it can affect the performance of both.
Duracell added: "Mixing a lithium battery with an alkaline battery will not improve device performance. In fact, it will reduce performance and may even damage your device or cause battery leakage or rupture.
"As well, do not mix different battery brands within a device. Doing so will reduce overall performance and may also cause battery leakage or rupture. We recommend using the same type of batteries within a device."
If batteries do leak, parents are advised to dispose of the damaged battery safely whilst wearing gloves and ensure the battery compartment is cleaned thoroughly before inserting new ones.
They added: "Ensure the electronic device is completely dry before trying a new battery."
