The key facts
- When a device runs on several batteries, their charge is depleted unevenly, so it is better to replace the whole set at once
- It is not recommended to mix batteries of different types and manufacturers, or rechargeable batteries with single-use cells
- Batteries should be removed from equipment that is unused for long periods and stored separately
One new cell won't save the device
If one battery in a remote control, wall clock, toy or string of lights runs flat, the usual habit of replacing only that one may result in the device working for less time than expected. Life.ru was told this by Yulia Sergeeva, technical expert at Camelion, a manufacturer of lighting and energy solutions for the home. The reason is that when several cells work together, their charge is depleted unevenly — this depends on the initial capacity, the degree of wear and the operating conditions. Even batteries of the same size can differ noticeably in remaining energy, so the device's performance is determined not only by the new battery but also by the condition of the others.
What other mistakes does the expert advise avoiding
According to Sergeeva, when choosing batteries it is important to consider not only the size (AA or AAA) but also the type: alkaline, zinc-carbon and lithium batteries differ in composition and purpose, and rechargeable batteries should not be used together with single-use cells unless the device manufacturer explicitly allows such a combination. It is also not recommended to combine batteries from different manufacturers — their capacity and characteristics may differ even with the same size and type. The best option is a set of identical cells of the same model, installed at the same time.
Storage and charging
Among common mistakes, the expert also named leaving batteries inside equipment that is not used for long periods — seasonal decorations, flashlights and toys: it is better to remove them and store them separately. Incorrect polarity during installation can cause the batteries or the device to overheat or be damaged. Cells should be stored in their original packaging, at room temperature, away from heat sources, moisture and metal objects, and out of the reach of children. Ordinary single-use batteries must not be recharged — only cells marked 'rechargeable' and a suitable charger are intended for repeated use. For high-drain devices, such as frequently used toys, rechargeable batteries are more convenient, in the expert's opinion, if they are compatible with the device.
A separate case — headphones
The same Life.ru article also mentions wireless headphones separately: they may drain noticeably faster as soon as a year after purchase due to natural battery wear. Overheating and charging habits can accelerate battery ageing, low temperatures temporarily reduce runtime, and being kept fully charged for long periods can also speed up ageing — which is why some manufacturers include an optimised charging feature.
