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Thread: razr getting up to 115 degrees

  1. Droid
    tstout's Avatar
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    #1

    razr getting up to 115 degrees

    is anyone else having problems with their razr getting really hot all the time? Cuz my does and it sometimes gets up to 115 degrees and i cant figure out why. so im just wondering if anybody is having the same problem as i am
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  3. Senior Droid
    Scott0719's Avatar
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    #2
    I notice mine gets hot when I'm at work and its usually on the charger. I'm also in 4G area so maybe that affects it too.
  4. Rescue Squad
    Sydman's Avatar
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    #3
    Mine gets rather warm when I am on 4G and tethering, or uploading a file while on 4G. Until they make better battery tech available to us I think we have to just live with it.
  5. Droid Ninja
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    #4
    My thunderbolt is reading 120 degree right now I never see it get much hotter than that tho..

    Sent from my ADR6400L using DroidForums
  6. Droid
    tstout's Avatar
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    #5
    Does it hurt the phones to get that hot
  7. Super Moderator
    FoxKat's Avatar
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    #6
    From BatteryUniversity.com (with comments from me in BLUE):

    The Lithium Polymer battery

    The Li-polymer differentiates itself from other battery systems in the type of electrolyte used. The original design, dating back to the 1970s, uses a dry solid polymer electrolyte. This electrolyte resembles a plastic-like film that does not conduct electricity but allows an exchange of ions (electrically charged atoms or groups of atoms). The polymer electrolyte replaces the traditional porous separator, which is soaked with electrolyte.
    The dry polymer design offers simplifications with respect to fabrication, ruggedness, safety and thin-profile geometry. There is no danger of flammability because no liquid or gelled electrolyte is used. With a cell thickness measuring as little as one millimeter (0.039 inches), equipment designers are left to their own imagination in terms of form, shape and size.
    Unfortunately, the dry Li-polymer suffers from poor conductivity. Internal resistance is too high and cannot deliver the current bursts needed for modern communication devices and spinning up the hard drives of mobile computing equipment. Heating the cell to 60C (140F) and higher increases the conductivity but this requirement is unsuitable for portable applications.
    To make a small Li-polymer battery conductive, some gelled electrolyte has been added. Most of the commercial Li-polymer batteries used today for mobile phones are a hybrid and contain gelled electrolyte. The correct term for this system is Lithium Ion Polymer. For promotional reasons, most battery manufacturers mark the battery simply as Li-polymer. Since the hybrid lithium polymer is the only functioning polymer battery for portable use today, we will focus on this chemistry.
    With gelled electrolyte added, what then is the difference between classic Li‑ion and Li‑ion polymer? Although the characteristics and performance of the two systems are very similar, the Li‑ion polymer is unique in that solid electrolyte replaces the porous separator. The gelled electrolyte is simply added to enhance ion conductivity.
    Technical difficulties and delays in volume manufacturing have deferred the introduction of the Li‑ion polymer battery. In addition, the promised superiority of the Li‑ion polymer has not yet been realized. No improvements in capacity gains are achieved — in fact, the capacity is slightly less than that of the standard Li‑ion battery. For the present, there is no cost advantage. The major reason for switching to the Li-ion polymer is form factor. It allows wafer-thin geometries, a style that is demanded by the highly competitive mobile phone industry.
    Advantages and Limitations of Li-ion Polymer Batteries

    Advantages Very low profile — batteries that resemble the profile of a credit card are feasible.
    Flexible form factor — manufacturers are not bound by standard cell formats. With high volume, any reasonable size can be produced economically.
    Light weight – gelled rather than liquid electrolytes enable simplified packaging, in some cases eliminating the metal shell.
    Improved safety — more resistant to overcharge; less chance for electrolyte leakage.
    Limitations Lower energy density and decreased cycle count compared to Li-ion — potential for improvements exist.
    Expensive to manufacture — once mass-produced, the Li-ion polymer has the potential for lower cost. Reduced control circuit offsets higher manufacturing costs.

    And the chart below shows the operating temperature ranges for the LIPO battery at between 0 & 60C, which is 32 to 140F. They essentially stop working at below freezing and at above 60C or 140F, they are damaged potentially to a point of complete failure. It should also be noted that exposure to temperatures of over 113F (45C) begins to have an effect on the usable life of the battery accelerating the slow decent to death. By manufacturing standards, a battery of this type which no longer can maintain a charge of 80% (in an earlier thread I had mentioned some manufacturers specify 70%), of the original battery's charge capacity is considered at end of life.

    NiCd NiMH Lead Acid Li-ion Li-ion polymer Reusable
    Alkaline
    Gravimetric Energy Density(Wh/kg) 45-80 60-120 30-50 110-160 100-130 80 (initial)
    Internal Resistance
    (includes peripheral circuits) in mΩ
    100 to 2001
    6V pack
    200 to 3001
    6V pack
    <1001
    12V pack
    150 to 2501
    7.2V pack
    200 to 3001
    7.2V pack
    200 to 20001
    6V pack
    Cycle Life (to 80% of initial capacity) 15002 300 to 5002,3 200 to
    3002
    500 to 10003 300 to
    500
    503
    (to 50%)
    Fast Charge Time 1h typical 2-4h 8-16h 2-4h 2-4h 2-3h
    Overcharge Tolerance moderate low high very low low moderate
    Self-discharge / Month (room temperature) 20%4 30%4 5% 10%5 ~10%5 0.3%
    Cell Voltage(nominal) 1.25V6 1.25V6 2V 3.6V 3.6V 1.5V
    Load Current
    - peak
    - best result
    20C
    1C
    5C
    0.5C or lower
    5C7
    0.2C
    >2C
    1C or lower
    >2C
    1C or lower
    0.5C
    0.2C or lower
    Operating Temperature(discharge only) -40 to
    60C
    -20 to
    60C
    -20 to
    60C
    -20 to
    60C
    0 to
    60C
    0 to
    65C
    Maintenance Requirement 30 to 60 days 60 to 90 days 3 to 6 months9 not req. not req. not req.
    Typical Battery Cost
    (US$, reference only)
    $50
    (7.2V)
    $60
    (7.2V)
    $25
    (6V)
    $100
    (7.2V)
    $100
    (7.2V)
    $5
    (9V)
    Cost per Cycle(US$)11 $0.04 $0.12 $0.10 $0.14 $0.29 $0.10-0.50
    Commercial use since
    1950 1990 1970 1991 1999 1992

    As far as component damage, the phone itself has temperature sensors (the numbers you are reading), and will make necessary adustments to clock rate by reducing it to use less power thereby producing less heat, killing certain applications running, and even doing either a soft or hard reboot to prevent damage to the components.

    You should protect the phone from excess heat in addition to what it is already producing, so don't leave it in the trunk or inside of a closed car in the sun, and whatever else you need to do to further protect it from the heat it's building up inside being enhanced by ambient temperatures outside. Remember, this IS a computer, but it doesn't have an active cooling fan like almost all laptops and nearly all desktop computers. Without a way to more aggressively move heat away, its only defense is to shut down services, radios, charging circuitry, and eventually itself.
    Last edited by FoxKat; 03-15-2012 at 04:41 PM.

    "Professor FoxKat"
    "Saving DROID Razr's, one battery at a time. :-)" - (credit SallyC)
    Avatar is Maxwell Smart, AKA Agent 86, from "Get Smart" (with his signature "Shoe Phone"), a SitCom TV series by Mel Brooks & Buck Henry, based on the spy thriller series, "The Man From U.N.C.L.E.".
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  8. Master Droid
    rherron's Avatar
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    #7
    How do you know the temp

    Sent from my DROID RAZR using DroidForums
  9. cdr
    cdr is offline
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    #8
    Mine gets warm when using 4g other than that wifi and 3g is fine

    Sent from my DROID RAZR using DroidForums
  10. Senior Droid
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    #9
    Is it only when streaming heavy data like movies or music over 4g?

    If not, I would be considering some kind of factory reset or whatever that factory
    reflash file I keep heering about (wipes everything off the phone).
  11. Super Moderator
    FoxKat's Avatar
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    #10
    The phone does also have a "Cool down" mode mentioned in the users manual which will announce on the display if the internal temperatures reach unsafe levels. If you've not seen that yet, I'd say you're probably OK.

    Sent from my DROID RAZR using Tapatalk

    "Professor FoxKat"
    "Saving DROID Razr's, one battery at a time. :-)" - (credit SallyC)
    Avatar is Maxwell Smart, AKA Agent 86, from "Get Smart" (with his signature "Shoe Phone"), a SitCom TV series by Mel Brooks & Buck Henry, based on the spy thriller series, "The Man From U.N.C.L.E.".
    "Guidelines of Conduct" for DroidForums.net
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