RTC Battery Backup

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User avatar
calpin
Site Admin
Posts: 46
Joined: Fri Apr 15, 2016 9:21 am

Tue Sep 19, 2017 9:29 am

ED209 wrote:
Thu Sep 14, 2017 9:18 am
calpin wrote:
Thu Sep 14, 2017 3:35 am
Some people even use a ultra capacitor to keep the power for RTC
Sounds like that's a very smart way to do that. Do you have any idea about how much capacitance is good?
I don't know the exactly model,but XH414HG-IV01E seems can work with the board.

User avatar
ED209
Posts: 222
Joined: Tue Apr 19, 2016 3:31 pm

Wed Sep 20, 2017 6:37 am

Just check the spec. It's just a 80 mF Cap. Thanks.

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ruthgibby
Posts: 1
Joined: Mon Oct 02, 2017 6:08 am
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Mon Oct 02, 2017 6:21 am

this is really nice to read..informative post is very good to read..thanks a lot.

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LaloARM
Posts: 14
Joined: Wed Jul 19, 2017 12:58 am

Sat Oct 14, 2017 8:53 pm

Hi.
Buy this battery https://es.aliexpress.com/item/20-Piece ... 0.0.8Pf2lI and it works perfect


20171014_173644.jpg
20171014_173644.jpg (1.72 MiB) Viewed 5664 times

User avatar
GTC
Posts: 32
Joined: Fri Sep 22, 2017 7:26 pm

Thu Jan 25, 2018 6:30 pm

Kind of resurrecting this thread!

Recently got forced to improve on the offline version of the infamous LP! We are working on getting 6x custom mobile instruments/stations for off-grid use. Those are to be dedicated to a research team leaving this April and coming back late Aug 2018.

One of the task I'm facing with now is the RTC battery, supercap, whatever works best for this. Needless to add I (we'd) like that battery to be alive & kicking for min/max 5 months maintenance free.

I've been harassing Panasonic and two other battery mfg today, for a lead on their best offer, and ended up being given 739 different options to chose from loll

so... I'd like to hear what others have done so far to keep time, extend batt life, magic connectors, etc etc :mrgreen:

thanks!

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Coco Xia
Posts: 75
Joined: Wed Aug 02, 2017 8:36 am

Tue Jan 30, 2018 9:21 am

Hi, has anybody met the problem below.
Sometimes, if the system crashes down without proper windows shutdown, we can not boot the system until the 3V RTC battery unplugged. :?:
Does someone help?

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LattePanda
Site Admin
Posts: 2688
Joined: Wed Jan 20, 2016 9:09 am

Thu Feb 01, 2018 2:59 am

Coco Xia wrote:
Tue Jan 30, 2018 9:21 am
Hi, has anybody met the problem below.
Sometimes, if the system crashes down without proper windows shutdown, we can not boot the system until the 3V RTC battery unplugged. :?:
Does someone help?
Hi, please make sure you've not reversed the positive and negative . :)
Enjoy Tinkering with LattePanda ! :lol:

User avatar
untitled86
Posts: 24
Joined: Thu May 04, 2017 4:30 am

Thu Apr 19, 2018 4:52 pm

@Coco Xia

We're having this problem as well. The voltage isn't reversed. Any other possible causes?
LattePanda wrote:
Thu Feb 01, 2018 2:59 am
Coco Xia wrote:
Tue Jan 30, 2018 9:21 am
Hi, has anybody met the problem below.
Sometimes, if the system crashes down without proper windows shutdown, we can not boot the system until the 3V RTC battery unplugged. :?:
Does someone help?
Hi, please make sure you've not reversed the positive and negative . :)

User avatar
LattePanda
Site Admin
Posts: 2688
Joined: Wed Jan 20, 2016 9:09 am

Fri Apr 20, 2018 4:03 am

untitled86 wrote:
Thu Apr 19, 2018 4:52 pm
@Coco Xia

We're having this problem as well. The voltage isn't reversed. Any other possible causes?
LattePanda wrote:
Thu Feb 01, 2018 2:59 am
Coco Xia wrote:
Tue Jan 30, 2018 9:21 am
Hi, has anybody met the problem below.
Sometimes, if the system crashes down without proper windows shutdown, we can not boot the system until the 3V RTC battery unplugged. :?:
Does someone help?
Hi, please make sure you've not reversed the positive and negative . :)
Would you mind to describe your case in details? Or some photos? How about the frequency of these similar situation?
Enjoy Tinkering with LattePanda ! :lol:

User avatar
untitled86
Posts: 24
Joined: Thu May 04, 2017 4:30 am

Fri Apr 20, 2018 3:46 pm

I don’t have a picture now of the battery connection, but I can supply one later.

We verified polarity by powering the device up without the battery and using a multimeter. Also the panda’s backup battery V+ pad has a mark above it, so we always had that wired correctly.

We’re using the auto power-on feature in the BIOS and the LattePanda simply refuses to power up sometimes. This happens very rarely, one out of 500 times. But only with the 3V backup battery connected.

I’m working with an experianced electrical engineer on this in a professional setting. We automated surprise resets to test our LattePanda based product and that’s how we discovered this problem.

If the panda refuses to turn on we can hold the power button down and it will reset and boot.

We’ve bought about 30 LattePandas so far. It’d be great if this could be fixed. I hope it’s a bios Power-On logic problem not a hardware problem.

LattePanda wrote:
Fri Apr 20, 2018 4:03 am
untitled86 wrote:
Thu Apr 19, 2018 4:52 pm
@Coco Xia

We're having this problem as well. The voltage isn't reversed. Any other possible causes?
LattePanda wrote:
Thu Feb 01, 2018 2:59 am


Hi, please make sure you've not reversed the positive and negative . :)
Would you mind to describe your case in details? Or some photos? How about the frequency of these similar situation?

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