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    Battery Voltage.
    31 Posts ยท 11 Followers ยท 7 Photos ยท 102 Likes
    Began 7 months ago by
    Leading Seaman
    United Kingdom
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    Latest Post 7 months ago by
    Warrant Officer
    United Kingdom
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    NickD
    Warrant Officer
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Battery Voltage.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 24 days ago
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    Quite simply I'll just wait and see๐Ÿค”
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    RodC
    Lieutenant
    ๐Ÿ‡จ๐Ÿ‡ฆ Canada
    ๐Ÿ“ Battery Voltage.
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    Roycv, very well said. I too take umbrage at the misuse of M versus m. Electrical units shud always be capitalized, they represent gentlemen's names...A=Ampere, V=Volta, W=James Watt, etc
    roycv
    Rear Admiral
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Battery Voltage.
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    I meant to add, recently I did buy some NiMh batteries from AliExpress and these were OK.
    Roy
    Len1
    Lieutenant
    ๐Ÿ‡บ๐Ÿ‡ธ United States
    ๐Ÿ“ Battery Voltage.
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    EdW and Roy. Thank you, both of you are right on.
    LEN1
    EdW
    Midshipman
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Battery Voltage.
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    I read articles like this with a great deal of interest, Roy sound like the voice of reason here. I qualified as an electrical engineer (light current) nearly half a century ago and have been in the game in some capacity or another all that time. Itโ€™s not only batteries that suffer from โ€œChinese Notationโ€ but many electronic components as well. The rule is simple, if it is too good to be true, it probably is.๐Ÿ˜Š
    roycv
    Rear Admiral
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Battery Voltage.
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    Hi all a quote from the Internet.

    A lithium-ion (Li-ion) battery (LiPo 3.7 volt) differs from a lithium iron phosphate (LiFePO4) battery (LiFe 3.6 volt). The two batteries share some similarities but differ in performance, longevity, and chemical composition.

    LiFePO4 batteries are known for their longer lifespan, increased thermal stability, and enhanced safety. (as used in cars)

    Regards
    Roy
    roycv
    Rear Admiral
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Battery Voltage.
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    Hi all I am getting a bit bothered with the posts about PP9 batteries.
    First the descriptions. M a capital means Mega or 1 million. m, little m means milli or 1 thousandth.

    As quoted 8800Mah for a PP 9 battery is just not possible otherwise electric cars would have the battery in the glove box.

    The PP9 battery is quite a small battery and to have these numbers printed on them is just not true. I looked some up on ebay and found some I might just believe at 1.2 Ahrs (or 1200mAhrs).
    Even this I find difficult for the volume of the battery.

    I was told from a GB supplier that in China you can get anything you like printed on any battery you want.

    About 7 or 8 years ago I bought a couple of 3800mAhr NiMh batteries. They did not seem to last very long and a while later I bought a piece of electronics which measured the i/p and o/p watt capacity of the batteries. My so called 3800mAh batteries were just over 1500 mAh each.

    With Nimh batteries as the capacity goes up so does the weight of the battery.

    Common sense once triggered can tell you that the numbers in the posts on this forum for this very small battery make them difficult to accept.

    Has anyone tried to use a PP9 battery as a drive battery? With the numbers quoted you should be able to run a small boat at full speed all afternoon. We know this is just not going to happen!

    I am not saying that members reporting this are mistaken, it is that what is printed is just not true!

    Phone your specialist supplier for batteries and have a chat with them. When I last looked on the Components Shop web site they had LiFe cells (3.6 volts per cell) at 2600mAh.

    The volume of the battery looks higher than the volume of a PP9 and the chemicals inside do all the work.

    LiFe cells at 3.6 volts are used in car batteries and many units of 50 volt blocks are used in parallel to get the capacity needed for the claimed mileage.

    Lipos that modellers use are a different combination of chemicals have 3.7 volts at the terminals.
    As an aside I have a 1 cell electric torch the Lipo inside says 3450 mAh capacity. I weighed it and it just can't be it is not heavy enough more like 1500mAh.

    As I said they will print anything you want on a battery out of China. Reliable countries are Japan and a lot of the far east and Europe and USA.

    Regards
    Roy
    NickD
    Warrant Officer
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Battery Voltage.
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    Like these but mine are 8800Mah
    NickD
    Warrant Officer
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Battery Voltage.
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    My PP9 batteries are rechargeable Lithium - ion
    DGoss999
    Warrant Officer
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Battery Voltage.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
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    NickD.. the PP9 you refer to is Zinc Carbon?? (typically these are 5Ah battery)


    https://uk.rs-online.com/web/p/9v-batteries/2282018
    Believe only half of what you see and nothing that you hear.
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