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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.
Hi folks....just wondering if li-ion batteries should disconnected from the tool and or charger when not in use for a while...going away on holiday for example? There was no mention of storage in the instruction manual.
Cheers.
malcky
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batteries
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We have a 6 year old Worcester Greenstar 24i Junior boiler. Recently the signal between the receiver on the boiler and the roomstat in the living room is ittermittently beign lost, it can go a couple of days working fine, then say on on evening if we increase the temp on the roomstat the signal...
Hi, went to charge 1 of my batteries and it makes the fan noise for first 5 seconds then fan noise stops. I left it on charge for 2 HOURS than the normal 30/45 mins charge.
Ive had them for 2 years.
Any ideas?
Koogatubac
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batteries
battery
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charger
makita
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problem
http://www.NoLinkingToThis/p/erbauer-erb373rsp-1100w-reciprocating-saw-240v/80388
Hi guys looking for a little input.
What do you think of this brand? They remind me of Makita, but what do you think?
I'm looking for a new ripsaw & recipitator!
Talk to me!!
Hey guys im just trying to start off as a plumber and trying to building up some decent tools, had brilliant info from previous threads so thanks alot but stuck as to know what would be the best all round drill for general plumbing, heard makitas the kiddie?
Looking at power tools and it would be nice to get them all from the one brand if thats even possible in order to save multiple charging units...but whats confusing me is if 1 companys 14.4v 3.3ah that came in a pack with drills....for example: Panasonic EYC108 14.4v Combi & Impact Driver Kit...
malcky
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about
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battery
hammer
maybe
question
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stupid
Seems to have good reviews for the NON big masonary jobs....would this be worth having or is there something a lot better?
Makita LCT204W 10.8V Li-ion Cordless Kit with 2 x 1.3Ah Batteries (2 Pieces): Amazon.co.uk: DIY & Tools
Cheers
ok so i ve got this problem thats annoying me, i have a friend with a Baxi 105e, the other day their batteries went in their drayton digistat 2 (not the rf) and since they have nt had heating, i ve tried reseting the boiler, taking batteries out etc but cant seem to get the stat to work, so i ve...
Anyone got any good recommendations for a decent radio? Ideally I'd like one that can run off batteries as well as mains and the ability to plug in an MP3 player.
My budget is around £70 so I was looking at the hitachi site radio.
Cheers
Pete
I have a warmflow U70 boiler and just recently it has stopped working for the downstairs heating but not the upstairs or the water heating. when i boost it downstairs nothing happens but if i boost it for the other two it fires up no problem. all the rads downstairs are full and have no need to...
jonnyohare
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batteries
boiler
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fires
oil
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Customer phoned me that their Watchman (old style) doesn't get a signal so I guess its the batteries. They are inside a copper tube on top of the sensor. Trouble is its a while since I last replaced any and I can't remember which ones or how many it takes. I dont seem to remember if they were...
Hi guys can i pick your brains, i need a new combi drill and have come across the new AEG 18v lithium-ion model for a decent price with 2 3.0 Ah batteries .Has anyone had one or used one ? If i can spend £200 rather than £300 plus it seems a good idea to me ( don't like spending money ) but...
hi guys,
after 5 years of constant use my 3 dewalt 18v xrp batteries finally look to be giving in...do the li-on batteries fit the old xrp tools and are they any better than the normal batteries?
cheers.
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