How Long Does a G5 Transmitter REALLY Last? **UPDATE-Transmitter Died** UPDATE-New Transmitter ***UPDATE-2nd Transmitter 😭

That is absolutely amazing. This is radically changing some of the understanding I had of the G4 and G5.

So do I get the Price is Right dead transmitter then? i think that was my guess…


@TiaG Can’t have my dead transmitter yet, it’s still going strong!

G5 Transmitter Weekly Update

Still going strong at 179 days! Resistance holding steady at 587, not even close yet to the dreaded 1000 mark.

The only puzzling glitch is that Voltage B has dropped below 300 to 299. Looks like that battery will be the Achilles heel. The question still is when it will fail.

But if it fails this week, well six months isn’t too bad.


I am thinking there must be a hidden movement-driven battery charger somewhere in your G5… You have a custom model!

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Nah, I think that cell B will fall off a cliff at some point, and the then it will be done in quickly.

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Looks like the end is near. Voltages are low and looks like they’re ready to plummet, and the transmitter to burn and die.

Note how xDrip+ now highlights these values in red. It’s already given me two notifications that the transmitter is almost dead.


Still pretty amazing that you have used it for almost a half a year!

Awe :upside_down_face:

Hi. I just joined this incredible group. I started my dexcom 5 on tax day, have been using xdrip+ and have already extended the battery life by 1 month. Could you tell me how you get that status screen? Mine is much less informative.
I’m not sure if this screen shot uploaded correctly.


Hi @Osoblu Welcome to the best DOC on the interwebs. Glad you joined us!

You can get other status pages simply by swiping left. The next one, the G5 status page, is the one with all of the juicy information.

I don’t remember, can you view the data on-line via Clarity with xDrip+ also? How do you see the trending data with xDrip? (past 7, 14, 30, 90 days data as you see online with Clarity/glooka)

@ClaudnDaye Harold, it’s all there. Just but the “hamburger” menu in the upper right, go to statistics, and you get all kinds of info for today, yesterday, 7 days, 30 days, 90 days. Here’s a sample.

Also, you can get a daily glucose track with daily stats by going to history.


3 posts were split to a new topic: xDrip+ on iPhones?

Well, almost dead. It’s been 186 days.

Been getting notifications from xDrip+ that the transmitter is almost dead for about a week now. Resistance is still pretty good (under 700), but the batterys’ voltages are just about ready to fall off of the cliff.
(Note that they are highlighted in red by the app)

These are the notifications I’ve been getting

On my last transmitter I only got the notification twice before the transmitter died. So this one doesn’t seem like it’s going to go quietly without a fight.


Well, the transmitter that wouldn’t die, died last night. Because I use the watch to connect to the transmitter the readings just stopped without any notification on the phone.

I woke up because my Bg was low at about 6am and noticed I had not gotten a reading for about five hours.

Unfortunately, I botched the screenshot (Bg was 45 so I’m not surprised), but Voltage A was 256 and Voltage B was about 230. Resistance was, remarkably only 557.

I think it lasted for a week and a half after the voltage dropped below 300 because the resistance stayed fairly low. @Chris, is this a valid assumption?

But the transmitter lasted for 191 days!
That is nearly twice as long as the Dexcom controlled 105 day limit. We’ll see how long the new one that I started this morning will last.


I am on day 149 of my first G5 transmitter. I have @docslotnick 's record of 191 days to beat.

VA = 314, VB=303 and Resistance at 641.


@Aaron GO AARON!
Be sure to keep us posted.


The basic equation for this is:

I = V/R

I = the Current; in a non chargeable battery you can think of current as the fuel.
V = volts
R = resistance.

Doc, so when talking about batteries that can’t be recharged, the lower the system resistance the faster the device will discharge. In this case I think the Resistance that is being reported to you is the battery internal resistance, which is a whole deeper and more complicated topic to tread into.

For the future, I would only look at the voltage to help you predict the end time. It looks like once the battery is unable to maintain the full 3.0 volts you have a couple of weeks left.


We should erect a statue to this transmitter!

“She/he died to further humankind’s striving for knowledge. May it rest in eternal peace, with voltage nevermore, nor current to its batteries.”

Unless, of course, you are planning to get a new battery into the thing :slight_smile:

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I spoke with Dexcom Technical support today and discussed the G5.

Dex Tech Support said that having more devices connected to the G5 transmitter at the same time will cause increased battery usage and hence decreased transmitter life.

So with Doc only running his smart phone against the transmitter, he could reasonably expect the G5 transmitter battery to last longer as opposed to somebody else running both the Dexcom Receiver and a Smart Phone against the G5 transmitter at the same time.

Dexcom also said the X2 will connect to the G5 as a receiver - not as a smartphone. Apparently there is some difference. The X2 additional Dex functionality will allow the Receiver to be completely replaced by the X2. This would be in line with the Tandem t:slim G4 which was shipped with the Tandem pump, the Dexcom G4 transmitter (and sensors) but no receiver. So one would assume that the standard testing would be with the X2 and Smart Phone connected to the G5 transmitter but without the receiver also being connected.