Search the forum,

batteries

An electric battery is a source of electric power consisting of one or more electrochemical cells with external connections for powering electrical devices. 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 will flow through an external electric circuit to the positive terminal. When a battery is connected to an external electric load, a redox reaction converts high-energy reactants to lower-energy products, and the free-energy difference is delivered to the external circuit as electrical energy. Historically the term "battery" specifically referred to a device composed of multiple cells; however, the usage has evolved to include devices composed of a single cell.Primary (single-use or "disposable") batteries are used once and discarded, as the electrode materials are irreversibly changed during discharge; a common example is the alkaline battery used for flashlights and a multitude of portable electronic devices. Secondary (rechargeable) batteries can be discharged and recharged multiple times using an applied electric current; 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 mobile phones.
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 or lithium-ion batteries in vehicles, 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.
Batteries have much lower specific energy (energy per unit mass) than common fuels such as gasoline. In automobiles, this is somewhat offset by the higher efficiency of electric motors in converting electrical energy to mechanical work, compared to combustion engines.

View More On Wikipedia.org
Recent contents Top users
  1. Best

    Duracell Batteries leaking

    Seems the AA & AAA Duracell batteries etc are no longer what they used to be, as they are leaking & causing damage to whatever they are fitted in. I am stopping buying them. What batteries are decent lasting & don't leak?
  2. M

    Which Cordless SDS drill

    Hi, I am in the market for a new cordless SDS drill, I currently have the Milwaukee cordless M18 Fuel combi drill and impact driver which are fantastic but the combi drill is sometimes not up to it on very hard walls. Not sure if I should go for the Milwaukee or another brand? if so what model...
  3. W

    Hhmm.. New thermostat doesn't use batteries and no display.

    I decided to change my digital thermostat for one with a backlight, only problem is there are only 2 wires (plus a blue and green/yellow taped up). When I connect the brown to the L and the black to L1 on the other side of the switch on the diagram, (as removed from the old thermostat), there is...
  4. M

    Cheap Milwaukee C12PD-202C Percussion Combi Drill

    Just a heads up to say Toolstation are selling the 12V Milwaukee combi drill with 2 batteries, charger and carry case for less than £100.
  5. R

    USA Tools from America

    Evening lads. Have Any of you ever had experience of using cordless tools from America? I'm a huge Milwaukee fan and my mum and dad are off to America next weekend and im after some of the tools they have available over there which aren't yet out in the UK. And at a much cheaper price
  6. P

    Rechargeable batteries

    Do any of you guys use rechargeable batteries in things like head torches etc? Are they any good? If they are what brands to go for?
  7. V

    This weekend only at Tradepoint

    Just had a Text saying they have an offer of a De Walt 18volt Lithiun Ion battery drill for £ 68.33 plus VAT . I was going to get one then I found out that it only has ONE battery with it . bit of a bummer . I need to replace my drill as the Nic cad batts are nacked . And would be expensive...
  8. P

    Anyone tried non genuine power tool batteries?

    Hi all, I have a load of dewalt xrp gear and the batteries are finally failing. They are of the NIMH chemistry variety. Has anyone tried the fake batteries you can get from ebay? If so what they like?
  9. M

    Hilti batteries

    Hi all got 4 hilti 3.3ah lion 22v batts brand new for sale and 4 used 2014 36v 3.0 lion for sale had me drills nicked on site covered by hilti for theft so got brand new set still had me batts so selling them open to offers
  10. M

    Hitachi 5.0Ah cordless - any good?

    Hitachi Dv18dsdl/jj 18v Combi Drill With 2x5.0ah Li-ion Batteries Anybody got these? Any good? I've currently got AEG 18V stuff, it's powerful enough and batteries last long enough for all general plumbing work but nothing lasts forever and this looks like it might be a good investment?
  11. S

    Makita combi set

    Picked up this set today http://m.NoLinkingToThis/p/makita-dk18000x2-18v-3ah-li-ion-twin-pack-combi-drill-impact-driver-lxt/13728?_bck=1 Looks very good if your after a good set can't wate to get on my next boiler install on Tuesday to use them lol
  12. K

    Makita batterys

    Just had to buy new 18v 3.0 lit battery from amazon since my other 1 packed in. What should i do with the broken one? Should i complain to amazon and say its faulty thats came or will they know by the serial numbers? Lol
  13. H

    Genuine Makita 18v Lxt batteries

    I have a few of these which I picked up from a closing down sale if anyone's interested. £50 including postage.
  14. R

    Want!!!

    LXT HRH01ZX2 Features - Makita X2 That is all
  15. JCplumb

    I had to use a screwdriver today!

    Lent a friend my cordless drill and asked him to make sure it was charged when I picked it up this morning. Went to do a rad swap and picked the cordless up on the way, the drill died undoing the first bracket. I then had to get one of those things that poor people call screwdrivers out of the...
  16. SimonG

    Milwaukee 18v Batteries

    I was just looking through the plumb center website, I use it to price jobs I'm indifferent about getting. If I do get it then it will be a good earner as I can get stuff cheaper elsewhere. Anyway I digress. BOGOF offer on the above batteries 2 batteries for £129.00 + vat.
  17. G

    Makita 4Ah batteries are here!

    They were most definitely worth the wait, 36 minute charge time for a 4Ah batt, nothing comes close to that A lot of the older stock has dropped in price, worth checking if you are after a new drill.
  18. P

    Kane 455 playing up

    Used my fga to tightness test ,had a bank of 8 meters ,on no1 it showed the ecv letting by ..double checked this with another gauge which was fine ,then my 455 showed that all 8 ecv's were letting by but they weren't ......is this a calibration issue ? It's only around 7 months old
  19. S

    charging a battery

    I have a new drill that came with 2 4.o ah batteries Li-On One of the batteries is showing that it now has one bar of power left but is still working normally. I am just wondering when is the best time to re-charge the battery? 1)When the battery has absolutely no power left? (so wont even turn)...
  20. S

    Any issues with Watchman sonic

    Hi guys, One of my customers has asked me to fit a watchman so she can monitor levels. She has mentioned the watchman sonic. Is this the best system to use compared to price? Do they work well and are batteries easy to change (if required) on the sonic unit. Cheers.
Creating content since 2001. Untold Media.

Newest Plumbing Threads

Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock