Loading ...
Sorry, an error occurred while loading the content.
 

RE: [Electronics_101] Lithium ion battery rating

Expand Messages
  • Larry Beaty
    A battery rated for 6800 MAhr or 6.8 Ahr really means it will put out 680 mA for 10 hours. That is how they cheat. In one hour, It may put out only 5.2 Amps
    Message 1 of 8 , Feb 18, 2013
      A battery rated for 6800 MAhr or 6.8 Ahr really means it will put out 680 mA
      for 10 hours. That is how they cheat. In one hour, It may put out only 5.2
      Amps for the hour. Specsmanship! Ain't it great!



      Larry



      From: Electronics_101@yahoogroups.com
      [mailto:Electronics_101@yahoogroups.com] On Behalf Of Howard Hansen
      Sent: Monday, February 18, 2013 1:28 PM
      To: Electronics_101@yahoogroups.com
      Subject: Re: [Electronics_101] Lithium ion battery rating





      On 2/18/2013 6:56 AM, normnet2003 wrote:
      >
      > I recently purchased the following battery:
      >
      http://www.ebay.com/itm/6800mAh-DC-12V-Super-Rechargeable-Lithium-ion-Batter
      y-Energy-Storage-Pack-/230806115118?pt=US_Rechargeable_Batteries
      <http://www.ebay.com/itm/6800mAh-DC-12V-Super-Rechargeable-Lithium-ion-Batte
      ry-Energy-Storage-Pack-/230806115118?pt=US_Rechargeable_Batteries&hash=item3
      5bd1dd32e> &hash=item35bd1dd32e
      >
      >
      > I planed to use it to power a device requiring 12 volts at 4 amps for
      > 10-20 minutes however their doesn't seem to be any power when I plug
      > the 4 amp device to the battery as opposed to plugging it into the
      > car's 12 power supply.
      >
      > I thought 6800 ma meant 6.8 amps for one hour?
      > What lithium ion battery rating should I order for a 12 volt 4 amp
      > 10-20 minute requirement?
      >
      > Norm
      >
      > __

      I see the battery comes with a built in on-off switch. By any chance did
      you forget to turn the battery on?

      The other Howard

      [Non-text portions of this message have been removed]





      [Non-text portions of this message have been removed]
    • normnet2003
      I ll try charging it again just in case. Norm
      Message 2 of 8 , Feb 18, 2013
        I'll try charging it again just in case.

        Norm

        --- In Electronics_101@yahoogroups.com, Frank Mead <wa6ujj@...> wrote:
        >
        > It will come to you not fully charged...charge it for 10 hours and give it
        > a try...
        > good advice howard.
        >
        >
        > On Mon, Feb 18, 2013 at 12:27 PM, Howard Hansen <hrhan@...> wrote:
        >
        > > **
        > >
        > >
        > > On 2/18/2013 6:56 AM, normnet2003 wrote:
        > > >
        > > > I recently purchased the following battery:
        > > >
        > > http://www.ebay.com/itm/6800mAh-DC-12V-Super-Rechargeable-Lithium-ion-Battery-Energy-Storage-Pack-/230806115118?pt=US_Rechargeable_Batteries&hash=item35bd1dd32e
        > > >
        > > >
        > > > I planed to use it to power a device requiring 12 volts at 4 amps for
        > > > 10-20 minutes however their doesn't seem to be any power when I plug
        > > > the 4 amp device to the battery as opposed to plugging it into the
        > > > car's 12 power supply.
        > > >
        > > > I thought 6800 ma meant 6.8 amps for one hour?
        > > > What lithium ion battery rating should I order for a 12 volt 4 amp
        > > > 10-20 minute requirement?
        > > >
        > > > Norm
        > > >
        > > > __
        > >
        > > I see the battery comes with a built in on-off switch. By any chance did
        > > you forget to turn the battery on?
        > >
        > > The other Howard
        > >
        > > [Non-text portions of this message have been removed]
        > >
        > >
        > >
        >
        >
        > [Non-text portions of this message have been removed]
        >
      • Andrew Mathison (Alice)
        I don t think discharging at close to the one hour rate to be a good idea. If there is a temperature sensor in the battery pack (there should be!) it will
        Message 3 of 8 , Feb 19, 2013
          I don't think discharging at close to the one hour rate to be a good idea.
          If there is a temperature sensor in the battery pack (there should be!) it
          will probably open the circuit quite quickly, even before you feel the
          temperature rise outside of the casing.....but maybe 5 minutes later......

          The supplier should be in a position to tell you what the maximum discharge
          current could be, but don't be surprised if it's only 680ma......

          Also, new batteries might need to be charged/discharged several times before
          full capacity is reached....depending upon chemistry and manufacturer....

          Remember, the 6800ma is the quoted capacity, not the discharge
          rate.....major difference.....

          Regards

          Andy
        • normnet2003
          I let the battery charge for 24 hours with the switch on but no luck. Today I did an online chat with the enjoydeal store website and they replied the max amp
          Message 4 of 8 , Feb 19, 2013
            I let the battery charge for 24 hours with the switch on but no luck.
            Today I did an online chat with the enjoydeal store website and they replied the max amp draw is about 1.5

            I am going to look into RC batteries as Stephan said they are typically meant for higher output.

            Norm

            --- In Electronics_101@yahoogroups.com, "normnet2003" <normnet2@...> wrote:
            >
            >
            >
            > I'll try charging it again just in case.
            >
            > Norm
            >
            > --- In Electronics_101@yahoogroups.com, Frank Mead <wa6ujj@> wrote:
            > >
            > > It will come to you not fully charged...charge it for 10 hours and give it
            > > a try...
            > > good advice howard.
            > >
            > >
            > > On Mon, Feb 18, 2013 at 12:27 PM, Howard Hansen <hrhan@> wrote:
            > >
            > > > **
            > > >
            > > >
            > > > On 2/18/2013 6:56 AM, normnet2003 wrote:
            > > > >
            > > > > I recently purchased the following battery:
            > > > >
            > > > http://www.ebay.com/itm/6800mAh-DC-12V-Super-Rechargeable-Lithium-ion-Battery-Energy-Storage-Pack-/230806115118?pt=US_Rechargeable_Batteries&hash=item35bd1dd32e
            > > > >
            > > > >
            > > > > I planed to use it to power a device requiring 12 volts at 4 amps for
            > > > > 10-20 minutes however their doesn't seem to be any power when I plug
            > > > > the 4 amp device to the battery as opposed to plugging it into the
            > > > > car's 12 power supply.
            > > > >
            > > > > I thought 6800 ma meant 6.8 amps for one hour?
            > > > > What lithium ion battery rating should I order for a 12 volt 4 amp
            > > > > 10-20 minute requirement?
            > > > >
            > > > > Norm
            > > > >
            > > > > __
            > > >
            > > > I see the battery comes with a built in on-off switch. By any chance did
            > > > you forget to turn the battery on?
            > > >
            > > > The other Howard
            > > >
            > > > [Non-text portions of this message have been removed]
            > > >
            > > >
            > > >
            > >
            > >
            > > [Non-text portions of this message have been removed]
            > >
            >
          Your message has been successfully submitted and would be delivered to recipients shortly.