The concept of battery memory is not wrong, but it doesn't apply to all rechargeables, and it's a problem that is slowly becoming something from the past.

But first, what is 'battery memory'? Anyone with a rechargeable device may have noticed that the battery life seems to get shorter as the battery gets older. You may have had your own theory about why that is, but when it comes to Baterias a Domicilio en Providencia , the short answer is 'crystal formation'.

In Ni-Cd batteries, as the battery ages crystals form inside. As the crystals get bigger, it gets harder for the charge to move beyond them. Eventually whole areas of the battery become unreachable for both use and recharge. Failure to completely discharge the battery before recharging has been highlighted as one major cause of the problem.

Thankfully the problem isn't a killer: discharging the battery fully before starting a recharge usually sorts the problem. In fact, many recharging devices now do a full discharge. Manufacturers also continue to improve their batteries to get around the problem.

Li-Ion and Ni-HM rechargeable batteries - the preferred power choice for devices such as cameras and mobile phones - work differently. These battery types do not suffer this problem and therefore do not need to be discharged before recharging.

Li-ion batteries actually have a longer life when charged little and often. Letting them go dead before recharging can shorten their life span. When it comes to cameras, battery death mid-shot could result in lost work.

Don't confuse Li-Ion batteries with the Lithium batteries available in household sizes. Li-Ion batteries are the square blocks that come with your mobile phone and some cameras, whereas Lithium batteries are those long-life - but non-rechargeable - batteries sold for high-drain devices, like cameras.

Myth three: Expensive is better

Manufacturers of known brand names would certainly like you to believe that their 'quality' batteries are far superior to the generic or 'own brand' batteries on the market. And there's nothing to say that you don't get what you pay for.

However, plenty of unbiased reviews can be found online to show that cheap batteries can give great service. 7dayshop's own rechargeable Ni-MH batteries have consistently received great reviews and very favourable comparisons with the big known brands. The internet is your friend when it comes to shopping around for the truth about low-cost versus supposed high quality batteries.

The biggest factor in getting the right choice for your device is knowing the differences between the various types and how they apply to your need. Lithium and Alkaline batteries both have good high voltage (1.5 and 1.75 respectively), whilst Ni-Cd and Ni-MH are lower (1.2), making them unsuitable for many devices that require four or more batteries.

However, unlike Ni-MH batteries, which maintain a fairly steady charge until their expiry, Alkaline batteries lose their voltage steadily as their energy drains. If your device has a power monitor, your choice could be important.

If you are after the greenest choice, you should be aware that Lithium batteries, whilst having an incredibly long life, cannot be recharged and are particularly toxic, as are the rechargeable Ni-Cds.

Using something like a camera, which is a heavy-draining item? Ni-Cds discharge swiftly, making them a problem for devices which use up lots of energy. In fact, both Ni-MH and Ni-Cd self-discharge over a matter of months: vital knowledge when fitting little-used devices.

There are many types of batteries, so before you pick up a generic pack from the supermarket, reassess your needs, your assumptions and your lifestyle. You could save yourself both time and money.

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