Is your Rezound Batt 3.7V or 3.8V?

[SamXp]

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.

Mine:

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

 

[TxGoat]

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]

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.

Mine:

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

Mine is 3.7V

 

[TxGoat]

Mine is 3.7V

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]

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.

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

 

[SamXp]

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.

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.

 

[moparharn]

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?

 

[apavolka]

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

 

[TxGoat]

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.

Well excuse me for not dawning my labcoat... 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.

 

[VTENGR]

Well excuse me for not dawning my labcoat... 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.

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

 

[SamXp]

Well excuse me for not dawning my labcoat... 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.

Just don't make it a habit!
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.

 

[VTENGR]

Well excuse me for not dawning my labcoat... 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.

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

 

[SamXp]

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

 

[trophynuts]

3.8 in mine. Weird

 

[Fors]

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.

 

[TxGoat]

Just don't make it a habit!
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.

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?

 

[tswany11]

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.

 

[jayochs]

h,mm, 3.7 launch day rezound here.

 

[TxGoat]

h,mm, 3.7 launch day rezound here.

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.

http://androidforums.com/3289044-post321.html

From http://androidforums.com/htc-rezound/444719-official-review-initial-impressions-thread-7.html

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.

 

[Grung]

3.7 here.

Build dates:
WNC 09/14
VH 09/18
WTD 09/22

 

[misan23]

3.7 here, mine was BEFORE launch day.

 

[rustyhokie]

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

Edit:
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

 

[TxGoat]

For the record, team 3.8 pwnz team 3.7's butt.....

 

[TxGoat]

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.

Also, I figured I'd go ahead and throw the Thunderbolt battery into the Rezound (I was still wearing my labcoat...DAMN YOU OP! ) 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??

 

[SamXp]

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.