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 gmc-600+ 2.19 Battery bug?

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balthus Posted - 02/25/2021 : 06:30:04

I just received my gmc-600+ via amazon (living in europe, so amazon was easier for tax/customs).
However, i already noticed annoying bug regarding the battery status.

It charged the whole night and icon is still showing half full.
Also when charging the percentage keeps changing like 34%, 50%, 36%...

Is this a firmware issue and if so where can we get latest version.
Does other ppl had similar issues or maybe the provided battery is faulty?

Is there a firmware page with some history of fixes?

Best regards,
12   L A T E S T    R E P L I E S    (Newest First)
EmfDev Posted - 08/16/2021 : 09:53:19
I think it is fixed in a latest update. But let me know if it still exists.
FBSMatt Posted - 08/15/2021 : 05:25:09
My 600+ has had something similar from new. It never bothered me though, I can just swap the battery or charge it externally. Interesting to hear of someone else with a similar defect.
blargg Posted - 03/22/2021 : 05:37:35
A general tip for devices you don't use a lot that have a lithium-ion battery: keep the battery charged only to around 50%. This reduces age-related degradation. Just don't let it drain all the way down in storage (check it once or twice a year).
EmfDev Posted - 03/10/2021 : 10:19:25
I see, we will check this and see if there was changes in the battery reading. Do you remember your initial firmware version?
Searinox Posted - 03/10/2021 : 02:32:41
The battery has been recharged less than 10 times. The device is almost 2 years old. What I need to note however, is that the issue started suddenly after a firmware update. As it stands now the battery continues to function normally and can last for an estimated 1-2 weeks of non-stop running at background levels of radiation with minimum screen backlight, LED and speaker on. Even when the device is at 90-99% charge, plugging it in while it's turned off shows the charge at around 60% until it's done charging.
EmfDev Posted - 03/09/2021 : 10:12:38
I will let the team know about this issue. Also Searinox, how long have you had the device? The battery also needs to be checked. It lasts around 1000 charge.
Searinox Posted - 03/09/2021 : 06:33:34
My GMC-600 always showed battery during charging fairly accurately, it was only after a previous update - I do believe 2.19 - that I started having issues like yours. Now on 2.22 the behavior persists, if discharged to 90%, it shows around 60% during charging and after slowly climbing to about 72% and staying there for a while, it jumps straight to 100%.
Damien68 Posted - 02/26/2021 : 07:11:57
on my GMC-500 + (the PCB is the same I think), I followed the traces of the PCB, there is a component specialized for the battery charger (U8 marked 'LTH7' on its case). after googling it, it is an 'LTC4054ES5-4.2' from Analog Devices with a RPROG resistance of 2k7 which makes a recharge current of 370 mA. So, the charger circuit is a stand alone one and independent of the measurements made by the microcontroller.
balthus Posted - 02/26/2021 : 05:49:00
Yes, indeed. Battery calibration/monitoring is never easy and depends on lot of factor.

I just want to be sure that the battery display is dissociated from the real charging part so it will stop charging before the battery over charge and could be destroyed or set on fire.

Best regards
Damien68 Posted - 02/26/2021 : 01:24:07
Originally posted by kotarak
I learned quickly that the best way is to plug it overnight and in the morning I have charged unit and simply I don't rely or even try to observe the indicator during charge.

I think like you that this is the best method.
to make a gauge as like there is on telephones, it is necessary to measure the current which enters and leaves the battery with a component specially made for this. obviously it has a cost.
Just by measuring the voltage of the battery, and in this context it cannot be very precise, but perhaps it could be better centered and more SW/HW filtered. but in any case, shouldn't expect too much.
kotarak Posted - 02/25/2021 : 15:12:54
I've had version 2.19 in my GMC-600+, currently running 2.22 (which fixed some bugs but introduced new ones) and unfortunately there is no improvement with the battery indicator during charging. During discharge it seems to measure OK but during charging it is not reliable at all. Here is what I wrote in a different post regarding the charge icon:
"- battery charge metering is very inconsistent and all over the place, especially during charging. For example: during charging my units shows randomly 52% then a moment later 68% than back to 65%. When I unplug it at 70% and turn it on it shows 83% with a msg but the battery icon is showing 100%. Repeated checks for the battery voltage thru the menu shows 80% - 81% -79% -81%"
I learned quickly that the best way is to plug it overnight and in the morning I have charged unit and simply I don't rely or even try to observe the indicator during charge.
EmfDev Posted - 02/25/2021 : 10:42:33
Hi balthus, can you email me your serial number? I will check the update for you. You can find it under Main Menu -> About -> Serial Number. Thanks.

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