10 pin Li-Po battery connector experiment

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Tue Mar 05, 2019 5:18 am

ccs_hello wrote:
Sun Mar 03, 2019 10:39 pm
Some asked me about how Windows 10 reports the battery status (charging level, power left, etc.) when using my experimental 2S Li-Ion battery "without the fuel gauge IC" over that 10-pin connector.
I retested my configuration and have to report that "it is not accurate nor trustworthy at all".
Several reasons and the main one is "mine cannot report the current flow thru the battery pack", thus only voltage level (on the LPA side, not the battery pack terminal side) is measured.
So it depends on the battery quality, battery discharge cycle times (battery age), specific battery's internal design, and the goofy/unpredictability of Windows charging/discharging estimation algorithm, the reported value can vary a lot.

Yet still an important message to take in: the battery charging circuit (CC then CV) still works. So in a way, the battery pack is doing its things.
Taping a sheet of paper on Windows' battery status reporting area probably helps more than having a status report at all.
Yes, I found that neither Macos nor Windows could display battery capacity correctly. Didn't LPA design this?

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Tue Mar 05, 2019 12:35 pm

Quote Didn't LPA design this?

This thread is just an investigative effort, as DIY under maker's spirit.
As I had stated, my DIY method does not have fuel gauge IC + I2C connection so no unreal expectations.

If the topic is why LP does not have an official support for battery pack, that's a different question.
I'd advise to go back to LPA's kickstarter campaign to see if there is a claim/promise on "a battery pack" or "any battery pack" support clause.
(then the slippery slope on what does the word "support" cover?)
BTW, the battery pack that we know "sort of" works is the Cube i7/i9 type. LP does not sell/support it AFAIK.

My point is, if this is about a commercial/mass produced/long term supported product, the expectation would be higher.
For a product like that, I'd say, go for a Cube i9 laptop and call it a day.
< --- Sorry have to point this out. It is not what we do not wish LP can do more and evolve/getting better-n-better, but how it got worded...

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Wed Mar 06, 2019 4:31 am

I don't mean that.
I hope the authorities can give us some advice on how to buy battery packs so that we can use LPA better.

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Fri Mar 29, 2019 12:25 am

Finally! I found it. Battery connector type is Molex PanelMate™ 51146.

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Wed Mar 11, 2020 8:30 pm

Is anyone in the US interested in buying one of these battery pack for the LPA? I used it and it work flawlessly. Looking to let mine go, will sell for cheap and ship immediately! DM me if you are interested!
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Tue Mar 31, 2020 10:41 am

What is the price including shipping? (Turkey Shipping)

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Wed Apr 15, 2020 6:21 pm

Has it been sold yet? If not, can I ask you to put it aside until the end of the coronavirus epidemic? Of course, I'll send a part of the payment straight away, as to prove I'm not going to ghost you.

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Wed Jul 22, 2020 7:17 am

I've been tinkering with one of the RRC branded smart batteries which comply to the smart battery standard. I've connected both power and I2C pins and the good thing is there is commmunication with my battery over I2C. The bad thing is that monitoring the communication with my logic analyzer shows that the LPA doesn't query for the current battery percentage, just voltage and current. So windows shows a percent value which has nothing to do with the real battery state.
May this be related to the "alpha state" auto power on bios?
The battery is still being reported as Intel Battery SR1 with a serial number "12345678" which seems rather generic. My guess is that (at least by now) the battery communicationisn't fully implemented on the LPA side. Any suggestoins? If you like I can append a log from my logic analyzer if this helps other people

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Wed Jul 22, 2020 11:59 am

AFAIK, such battery monitoring capabilty is a software module specifically written for a selected subset of supported battery packs
<-- in the laptop world, it is very selected such that only OEM battery pack can be used (this is one way to make money)
which in turn will be part of BIOS.

P.S. I'd rather see a few generic battery packs can be used without real battery capacity support
than only one specific make/model battery pack is supported.

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Thu Nov 12, 2020 1:23 pm

EmCV93nVoAApQj4.jpg (198.05 KiB) Viewed 2927 times
DIY 148Wh battery anyone? (4*10Ah 3.7V lipo 2S2P)
So far powering and charging works fine, but as there is no fuel gauge there's no "batt percentage" etc or low battery auto-shutdown etc. Power will just abruptly cut when the BMS cuts power due to over-discharge protection. Stopping charging is dependant overcharge protection function of the BMS.
Not really ideal, but eh, probably gonna wire some circuitry for external monitoring outside of the lattepanda.

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