battery replacement

A mercury battery (also called mercuric oxide battery, mercury cell, button cell, or Ruben-Mallory) is a non-rechargeable electrochemical battery, a primary cell. Mercury batteries use a reaction between mercuric oxide and zinc electrodes in an alkaline electrolyte. The voltage during discharge remains practically constant at 1.35 volts, and the capacity is much greater than that of a similarly sized zinc-carbon battery. Mercury batteries were used in the shape of button cells for watches, hearing aids, cameras and calculators, and in larger forms for other applications.
For a time during and after World War II, batteries made with mercury became a popular power source for portable electronic devices. Due to the content of toxic mercury and environmental concerns about its disposal, the sale of mercury batteries has been banned in many countries. Both ANSI and IEC have withdrawn their standards for mercury batteries.

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  1. Kompins

    Replacing 12v battery

    Our SR 5 is now 4½ years old and the 12v battery charging rate has been a little erratic recently, finally my wife experienced loads of warnings whilst driving home causing a minor panic so I ordered a Varta Silverline from BMS Technologies (excellent price and next day delivery, though APC did...
    • Kompins
    • Thread
    • battery replacement battery terminal bms technologies mg5 system warning varta silverline
    • Replies: 1
    • Forum: MG5 EV Forum
  2. D

    12 volt battery

    Hi there MG4 owners, I recently had a problem with my 12 volt battery and was quoted £180 by my local dealer for a replacement. I think it's got a bit more life left in it but want to be prepared to replace it. So does anyone know the correct model number or even a better replacement at a...
  3. R

    How hard can it be to get a new 12v battery fitted?

    Harder than it used to be, it seems! I went to my local Halfords store, as I could get free fitting. All ordered and booked, no problem. Then when they saw the car they said they're not allowed to work electric cars, as they have to be specially trained, because they're interfering with...
    • rjb1970
    • Thread
    • battery replacement electric car maintenance halfords mg5
    • Replies: 12
    • Forum: MG5 EV Forum
  4. Cafeg

    missing emergency key

    Our key fob battery went flat and we had to use the emergency key to get into the car. When I replaced the batteries in both fobs I noticed there was only one emergency key. Has anyone else found this in their key fobs ? Car is a 2023 phev.
  5. Jto

    Winter coming 12V battery

    Hi all Winter is coming and just like ICE the 12V battery needs to be monitored and a lot of people over look this. Up until last month I used my car every day and did 18 miles each week day, now I have retired the car is not used every day and also a lot of short journeys so the 12V battery may...
    • Jto
    • Thread
    • battery charging battery replacement car maintenance electric vehicle mg car winter driving
    • Replies: 26
    • Forum: General Chat Forum
  6. J

    Rusty bolt head on battery tray

    Changed my 3.5 year original 12V battery, (battery test machine gave it 12% health and had occasionally got dash message to charge it). Seems a daft design some electonics box is mounted on the battery tray blocking access to the battery clamp bolt. Bolt heads for mounting bracket of said box...
    • James83
    • Thread
    • battery replacement battery tray bolt corrosion mg5 mounting bracket
    • Replies: 3
    • Forum: MG5 EV Forum
  7. Claire Fletcher

    Recoding when installing new auxiliary battery

    I am constantly disappointed that service centres and roadside assist dont know this. And because I am a female 69 yrs I get gaslighted on it. Like it doesn't exist and I am making it up. I hjad it from MG when a new battery is installed there is a redoing to be done. Help does anyone have...
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