batteries | Page 4

batteries

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  1. P

    Emergency lighting batteries - Power off?

    I have to change a number of batteries in emergency maintained lights, but am slightly concerned if I keep the mains power on I might potentially mess up the electronic modules. Turning the power off will slow me down so I prefer not to. Not something I do too often so advice appreciated?
  2. M

    Connect 25 AA batteries in parallel and series

    Hello, I have 25 batteries that are AA using 1.5 volts each, that is total = 37. 5 volts for 25 batteries. I want to know please the right way to wire all the batteries together to make a parallel and series battery pack. Please tell how to wire each battery together to connect all 25 AA...
  3. J

    How would you power this LED instead of using 8AA batteries?

    The LED light is for a moth trap (identifying not killing). At the moment I'm using 8 AA batteries. The batteries are 2000 mah so 1.6 amp hour in total (I think my maths is correct on that- 2000mah x 8 = 16000 divided by 1000 = 1.8 amp hour). The boost buck regulator has 9.6 volts going in...
  4. W

    split charge relay to charge two 6v 4.5ah batteries

    I have two maplin 6v 4.5ah batteries wired in series to power my dashcam while parked. The batteries are similar to this one : Will this split charge relay be ok to re-charge the batteries while driving? Maypole 292 20A Caravan Dual Charge Relay Kit: Amazon.co.uk: Car & Motorbike -...
  5. U

    DEWALT Flexvolt 18v-54v batteries

    Been looking into these batteries from dewalt standard 18v battery but has an output equivalent to 54v. Bloody expensive but they look like they will last ages and produce some serious output...
  6. D

    PLC Power Supplies

    Can anyone tell me two separate ways of powering a PLC (I'm guessing that part will be mains supply and battery) but more so the advantages and limitations to both?
  7. N

    WIFI Door Bell

    Hi guys Merry Christmas I have an E Prance WIFI door bell system but the batteries hardly last a week, the bell takes 3 x AAA batteries, Can I connect a mains to 4.5 volt DC transformer onto the bell without blowing the thing up. Many thanks Nick
  8. O

    12v LED lights/Lead acid battery help

    Hello all, this is my first post so please don't grill me too soon ;) So I've finally got mains in my shed after a few years of using 12v lighting and rolling the extension lead out when required. For a year or two, I have been running 6 x 4.5w LED clusters as main lights using a pair of 12v...
  9. HappyHippyDad

    3ah, 4ah or 5ah?

    Evening all. My friend has asked me if he should buy 3, 4 or 5 Ah makita batteries. All my batteries are 3Ah so I do not feel equipped to answer him as I have no experience of the others. I am completely happy with the 3Ah ones, however what do you guys think? Is it better to have the 5Ah as...
  10. A

    Using rechargeable batteries in fluke MFT

    Hi everyone Just a quick question is it ok to use rechargeable batteries in my fluke multifunction tester. Or can it give me off readings ?
  11. Energetic

    VAT rating on batteries and off grid.

    Been out of the loop for a bit, am I right in assuming that batteries for a domestic self consumption situation are 5%? Also for off grid systems? Cheers E
  12. S

    Researchers Find New Ways To Make Clean Hydrogen, Rechargable Zinc Batteries

    New technologies have now been developed to tackle two of the world's biggest energy challenges -- clean fuel for transportation and grid-scale energy storage. The researchers described their findings in two studies published this month in the journals Science Advances and Nature...
  13. E

    Next Generation Anode To Improve Lithium-ion Batteries

    Researchers have created a new silicon-tin nanocomposite anode that could lead to lithium-ion batteries that can be charged and discharged more times before they reach the end of their useful lives. The longer-lasting batteries could be used in everything from handheld electronic devices to...
  14. B

    Hybrid without batteries or grid tied with Auto transfer switch? Will it work?

    I am in the process of designing a system for deployment in Southern Africa and looking for some help/input from fellow solar installers and enthusiasts. Their grid is somewhat hopeless and is often turned off due to lack of supply - load shedding. I am looking at the possibilities I have ahead...
  15. rolyberkin

    Batteries for MFT?

    The AA rechargeable cells in my Metrel MFT have given up the ghost, anyone have any recommendations for good quality replacements?
  16. P

    Combi drill and prices!?

    Hi all, I'm looking to buy a decent (not overly expensive) combi drill. Any recommendations and ideas of what sort of price I should expect? Thanks in advance
  17. L

    D Cell batteries question

    Hi, I hope this is the right place or even forum to get the answer to this. If an electrical product would normally accept 6 x D (LR20) batteries. And I wanted to extend the time that the unit went before needed to have it's batteries replaced. Would adding another 6 batteries to the existing...
  18. R

    Megger 1552 easy repair or is it time to buy a new test kit ?

    Hi all, just wondered if anyone has had a similar issue with their 1552 or 1553 Megger mft ? noticed the fault started just after I changed the batteries, fuse logo came up on screen so changed that, now it works, but when testing live circuits it completes the test, but then within a few...
  19. S

    Battery Storage

    Hi folks, what is the score now with HSE etc and storage batteries on a solar installation? I know banks of storage batteries were a big no-no a while back, I help out with a wildlife charity who have a completely off grid solar set up with approximately 1500ah of battery power @24volts, I'm...
  20. Davisonp

    Emergency Light testing and repairs

    I have a couple of questions about testing and maintenance of emergency lights. I have been told that if the LED on an emergency light does not work it must be considered “Failed” and the fitting replaced, but when reading up, I cannot find any regulations or guidance to suggest this is...

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