battery cover

An electric battery is a device consisting of one or more electrochemical cells with external connections provided to power electrical devices such as flashlights, smartphones, and electric cars. When a battery is supplying electric power, its positive terminal is the cathode and its negative terminal is the anode. The terminal marked negative is the source of electrons that when connected to an external circuit will flow and deliver energy to an external device. When a battery is connected to an external circuit, electrolytes are able to move as ions within, allowing the chemical reactions to be completed at the separate terminals and so deliver energy to the external circuit. It is the movement of those ions within the battery which allows current to flow out of the battery to perform work. Historically the term "battery" specifically referred to a device composed of multiple cells, however the usage has evolved to additionally include devices composed of a single cell.
Primary (single-use or "disposable") batteries are used once and discarded; the electrode materials are irreversibly changed during discharge. Common examples are the alkaline battery used for flashlights and a multitude of portable electronic devices. Secondary (rechargeable) batteries can be discharged and recharged multiple times using mains power from a wall socket; the original composition of the electrodes can be restored by reverse current. Examples include the lead-acid batteries used in vehicles and lithium-ion batteries used for portable electronics such as laptops and smartphones.
Batteries come in many shapes and sizes, from miniature cells used to power hearing aids and wristwatches to small, thin cells used in smartphones, to large lead acid batteries used in cars and trucks, and at the largest extreme, huge battery banks the size of rooms that provide standby or emergency power for telephone exchanges and computer data centers.
According to a 2005 estimate, the worldwide battery industry generates US$48 billion in sales each year, with 6% annual growth.
Batteries have much lower specific energy (energy per unit mass) than common fuels such as gasoline. This is somewhat offset by the higher efficiency of electric motors in producing mechanical work, compared to combustion engines.

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  1. pwood

    Olympus EM10 MK2 replacement battery cover

    Has anyone had to replace their battery cover. Poor design which give the rest of the camera is so good is a shame. Is it worth contacting OM as the only half sensible replace,e t is on Ali Express at over £40 and EBay originals are double that?
  2. A

    Question Back cover detaching from phone

    Hi all, i have a Huawei Nova3i bought exactly 2 years ago and i just realised the back cover is ripping apart (see photo). Any advice or clue how to repair or what's the reason... My partner says it's the battery and it can explode anytime but i would like to avoid changing phone... Maybe i can...
  3. M

    Question Yamaha remote battery cover for RX-671

    Hi, I recently sold a Yamaha receiver on eBay and somehow the battery cover went missing. I have no idea how it got lost because I used it a week before selling it and the cover was intact. Really weird. Anyway, the guy really wants to get this resolved and asked me if I want to pay half for a...
  4. Steve Stifler

    Lindy NC-40 headphone - battery cover help

    Just received a pair of these and they look and feel really nice. Only problem is I cannot get the battery cover off. Instructions say to release the catch at the bottom of the right headphone. I've tried pushing, levering but cannot get the thing off. Before I return the product, maybe...
  5. S

    Removing the B&W zeppelin remote battery cover

    Hi, Is there a knack to doing this? The manual says to rotate the cover anti clockwise but I can't get it to turn either way. I've used thumb pressure as the direction arrows on the back aren't deep enough to get some sort of tool into them for leverage. I've done this before with a...
  6. Romero

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    broke the tab off the remote for this set anyone know of an online seller I can pick one of these up? I could buy a full remote but a bit of a waste. Thanks
  7. USS_Enterprise

    Sky HD remote Battery Cover replacements

    I have a Sky HD box and recently managed to break the latch on the Battery cover. Does anyone know if you can get replacements for just the covers, or would I have to replace the entire remote?
  8. P

    Faulty battery cover on my HD remote

    The battery cover on my HD remote has gone faulty because it keeps on dropping off,as i am still under warranty would sky send me a new battery cover or not?thanks ps i have emailed them but no reply yet
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