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Thread: Poor Battery Life on EF Johnson 5100

  1. #1
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    Default Poor Battery Life on EF Johnson 5100

    Is anyone else seeing poor Battery Life on these EF Johnson 5100's? I have a few of these 900 Mhz Radios and a UHF Range 2 Model that I have noticed on. This with both my Motorola NNTN6034 (4150 Mah) and Motorola NNTN8923AR (2000 Mah?) that are brand new. I get about 15 hours out of the NNTN6034A and about 7 1/2 hours out of the NNTN8923AR in RX only. Anyone else notices this or is it just me. I am using on all Conventional Channels put have the radio in scan all the time.
    Last edited by trbo90; Dec 30, 2012 at 09:42 AM. Reason: Put 51000 rather then 5100 in Title


  2. #2
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    One of my 900 radios get's noticeably warm on receive. I've decided not to use that radio.

  3. #3
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    I noticed that also with 2 of the 900 Mhz I had and they were replaced... These don't get warm, just uses up the battery quick....

  4. #4
    drdrew81 No Longer Registered

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    New here, just wondered if using EF johnson batteries vs. motorola xts5000 batts. in my efj 51sl i use the motorola batt. Does anyone have a efj radio and battery to test if it gets hot or had decreased battery life

  5. #5
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    I use a used EFJ battery on my 5100 UHF, its good for about 8 hours of mixed transmit and receive. I do also have some 10+ year old XTS5000 batteries I have for backups that get 6 hours.

  6. #6
    Box15C3 No Longer Registered

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    my 51 on a 800Mhz system has no issues.

  7. #7
    Box15C3 No Longer Registered

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    My EFJ51 has no issues. I monitor a 800Mhz system with a large scan list.

  8. #8
    Box15C3 No Longer Registered

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    No issues here.

  9. #9
    screa34 No Longer Registered

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    I've also noticed it getting warm on 900mhz scan or no-scan with short battery life.

  10. #10
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    Sounds like excessive current draw. Has to be a failed component (or two) in there somewhere.

  11. #11
    screa34 No Longer Registered

    Default EF johnson heating with poor battery life

    Quote Originally Posted by IntrinsicallySafe View Post
    Sounds like excessive current draw. Has to be a failed component (or two) in there somewhere.
    I'm just wondering if I could have something set in the software causing it do transmit maybe looking for a trunking signal or something? The sofware talks about GPS, not sure if the radio actually has a GPS or not?

  12. #12
    screa34 No Longer Registered

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    could it be something in the software set incorrectly? I am only using it for conventional, but if it thought it was supposed to be on a trunking system might it be transmitting looking for the system? I'm just taking a stab at possible problems I might be able to fix tonight?

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    I don't think so, i have two 900mhz units programmed identically, one has this issue the other is fine.

  14. #14
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    Quote Originally Posted by screa34 View Post
    I'm just wondering if I could have something set in the software causing it do transmit maybe looking for a trunking signal or something? The sofware talks about GPS, not sure if the radio actually has a GPS or not?
    The radio cannot do GPS on its own. It takes 3rd party GPS Speaker Mic to do GPS.