Is your Rezound Batt 3.7V or 3.8V?General

What voltage is specified on your Rezound Battery?

  1. 3.7VDC

  2. 3.8VDC


Last Updated:

  1. SamXp

    SamXp Well-Known Member

    I just ordered a few HTC Thunderbolt batteries for my Rezound, but have been reading quite a bit about a discrepancy. The TBolt batt is 3.7V and Rezounds seem to have shipped with either a 3.7v or 3.8v. Pull your batt and let us know which yours shipped with.

    Some others (Thunderbolt on left, Rezound on right):

  2. TxGoat

    TxGoat Guest

    Thunderbolt batteries will cause the Rezound to throw an error. It may not be an immediate issue, but you're powering a dual-core over a single core. I'm not sure I'd take a chance with the Thunderbolt battery inside the Rezound.

    VTENGR Well-Known Member

    Mine is 3.7V
  4. TxGoat

    TxGoat Guest

    Your Rezound's battery is 3.7? Is it red? If so, I'm surprised it didn't throw an error message on the notification bar.

    VTENGR Well-Known Member

    Yup... Red.... battery that came right out of the box when I got the phone on Thursday.
  6. SamXp

    SamXp Well-Known Member

    That's not a scientific statement. Some have experienced errors that they attribute to using a Thunderbolt battery in a Rezound. Some have used them with no issues. Correlation is not causation.
  7. moparharn

    moparharn Well-Known Member

    Is the extended battery (2750 mah) a 3.7 or 3.8V. Since mine is a 3.7v, does this mean I can use the Tbolt battery? Will one voltage last longer than the other?
  8. apavolka

    apavolka Well-Known Member

    Mine is 3.7. That's weird that there is two different ones.
  9. TxGoat

    TxGoat Guest

    Well excuse me for not dawning my labcoat... :p Based on a user that stated he threw a Thunderbolt battery into his Rezound and immediately received a warning on his notification bar, I wouldn't throw a Thunderbolt battery into the Rezound. At the risk of not sounding "scientific enough", I would ask you why HTC would make a battery rated at 3.8V for the Rezound if they thought they could just slap in the 3.7V in the Rezound without issue? It seems that if HTC was comfortable enough with the 3.8 and 3.7 being interchangeable from an engineering standpoint that they'd just release the Rezound with the 3.7 battery since it would streamline manufacturing costs of the battery.

    VTENGR, you wouldn't mind taking a pic of the red battery with the 3.7V rating would you? Seems like either they ran short on supply of the 3.8V battery and just started packaging the phone with the 3.7V or maybe your phone was one that was subject of HTC's quality control issues. I'm curious either way.
  10. VTENGR

    VTENGR Well-Known Member

    Don't mind taking a pic but my phone is my only camera so I'm not sure how I'm gonna do it.
  11. SamXp

    SamXp Well-Known Member

    Just don't make it a habit! :p
    Seriously, though - there's nothing wrong with speculation or opinion. I just tend to be careful about stating it as such (engineer in my day job when I'm not geeking out over Android phones).
    My speculation on the voltage difference is that the Rezound 1.5GHz CPU could benefit from the slight increase in voltage, and that they are phasing in the higher voltage, but didn't have time to ensure they could purge inventory of 3.7V batts before launch.

    If they're shipping 3.7V Rezounds, though, then there isn't a reason the Thunderbolt batt should throw an error, unless there is some identification circuitry. This has never been the case previously with hTC phones so its not likely - but certainly possible.
  12. VTENGR

    VTENGR Well-Known Member


    Only thing i see different from the 3.7 to the 3.8 is that the part number ends in -03M instead of -02M
  13. SamXp

    SamXp Well-Known Member

    Interesting that the 3.8 seems to be an older revision. I wonder if its the other way around and they thought they needed 3.8 and later discovered 3.7 would do (and likely decrease power consumption)

    Several users seem to have had no issues with Thunderbolt batts in their Rezound in this thread:
    Looking for a Rezound owner w/a thunderbolt - Page 2 - xda-developers
  14. trophynuts

    trophynuts Well-Known Member

    3.8 in mine. Weird
  15. Fors

    Fors Member

    3.7 in mine as well, so now the question is which can use the thunderbolt battery swithout error. The stock 3.7 or 3.8 users.
  16. TxGoat

    TxGoat Guest

    When I ordered my Rezound spare battery back about a month and a half ago, it came with the same 3.8 voltage so I'm not so sure about phasing in a higher battery. If anything you'd think that it would be the opposite (you'd think a spare battery ordered a month ago would be the 3.7). An interesting test would be to see what everyone's build date or purchase date was on the phone. Maybe the date stamped on the back of the battery cover is the manufacture date. I have 110927 stamped on the inside of the phone (red plastic), and 20110915 on the back battery plate. Considering these phones aren't exactly manufactured in the U.S. it's probably a manufacture date of Sept '11. Anyone with a 3.7 red battery show anything other than 09/11 as a possible manufacture date?
  17. tswany11

    tswany11 Member

    I have the "red" 3.7V - I found this interesting. It was reading 3.79-3.8 VDC

    Note: this is not a cheap hardware store multimeter.

    Attached Files:

  18. jayochs

    jayochs Well-Known Member

    h,mm, 3.7 launch day rezound here.
  19. TxGoat

    TxGoat Guest

    What's the build date though inside your cover? I think since the Rezound has only been out 1 week (unless you were one of the lucky ones to get it 2 Thursdays ago) you won't be able to really tell if your phone was an early build or not.

    Here's the link to the discussion about the battery error.



    Who knows maybe they tweaked the final release so that it was ok with both batteries. Would make sense since you have 2 phones that take the same batteries, might as well make both batteries available to both devices to limit confusion.
  20. Grung

    Grung Active Member

    3.7 here.

    Build dates:
    WNC 09/14
    VH 09/18
    WTD 09/22
  21. misan23

    misan23 Well-Known Member

    3.7 here, mine was BEFORE launch day.
  22. rustyhokie

    rustyhokie Active Member

    3.8 for my 1620 battery will check the extended battery later. Bought this past Saturday.

    3.7 for 2750 battery bought same time from same Verizon corp store. Both batteries are red HTC batteries.

    Original Cover
    WNC 09/14
    VH 9/19
    WTC 9/24

    Extended cover two dates
    10/06 and 10/12
  23. TxGoat

    TxGoat Guest

    For the record, team 3.8 pwnz team 3.7's butt..... :p
  24. TxGoat

    TxGoat Guest

    So I came home and decided to dawn my labcoat....

    I pulled the battery in my phone which indeed is 3.8V but I also grabbed my "spare". Apparently I had the spare in the phone thus when I grabbed the 2nd battery, sure enough it said "3.7V", thus I want to retract my "team 3.8V" post above and need to amend my vote. :p

    Also, I figured I'd go ahead and throw the Thunderbolt battery into the Rezound (I was still wearing my labcoat...DAMN YOU OP! :p ) Sure enough, the Rezound screamed like a little bish.... I took that thing out quick. Below are pics.

    Oh and pay no mind to the 32 GB micro card. Apparently I got a pre-production prototype that had a 32 GB card. HTC put 16 GB in when they found out the Nexus was going to suck by having 16 GB sealed they downsized their offering. I'M SOOO FULL OF CRAP AREN'T I?? :D



    Attached Files:

  25. SamXp

    SamXp Well-Known Member

    Interesting results! Now I'm wondering if the [=!=] icon gets thrown when it notes a significant change in voltage. But you have a 3.8 that came with the phone and a spare 3.7 and neither of those throw an error but the Thunderbolt battery does. Puzzling.

    My Anker 1700mAh 3.7v batteries are coming in today so we'll see what happens with those.

Share This Page