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Repair guides and support for Lenovo's line of consumer-oriented laptops, the IdeaPad series, first announced January 2008.

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Battery voltage extremely low

So, I have a lenovo Ideapad 730s/Yoga S730-13IML. And when in HWiNFO64, I find that all the battery values are at 1.273 volts. Looking on ebay at replacement batteries they’re all (Of the one i found lol) 15.36 volts. Also, it loses power completely when its unplugged and the bios doesn’t save anything i do (E.G changing the “Charge in sleep” mode). When plugged in, the machine auto starts for about a minute then displays a “Real time clock error - Check date and time settings” with a beep followed by it booting into windows 10.

This laptop is just under 3 years old and has no warranty. I’d love to get this working so i can keep it out of the e-waste pile.

Hopefully you guys can give me a hand in what to look for and subsequently do.

Thanks,

Nick

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Also, whats the difference between IWL and IML (My model)

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Hi @np_f1_2021 ,

Have you checked that the charger is supplying the correct voltage etc.? It may be that it can run the laptop but not charge the battery at the same time. What happens if you just charge the battery without turning the laptop on? Does it show that it is charging and then finally fully charges? If so does it still fail to run on the battery only?

You can also create a battery report to check the status of the battery etc. Compare the Design Capacity value versus the Full Charge capacity value and also to check if it is even connected.

To find compatible batteries for the laptop, here’s the parts list for the laptop.

Click on Select Commodities > Rechargeable batteries and internal (4) to find the part numbers for all the compatible batteries. Search online using the part number only to find suppliers that suit you best.

Here’s the hardware maintenance manual for the laptop. Go to p.31 to view the necessary pre-requisite step and then the procedure to remove/replace the battery pack.

Not sure with this laptop but there is no RTC battery (aka CMOS battery) on the systemboard so I was wondering if the BIOS settings were maintained either by the main battery or perhaps a capacitor on the board.

As for the differences between an -13IML model and an -13IWL model, as far as the battery goes there is none as they use the same batteries (see the IWL parts list. As for the rest I didn’t check ;-)

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1: IDK how to check for the voltage that the charger is supplying the laptop but the charger says that both are 65w and do 20v out (Thats what i can tell))

2: Battery report doesn't work :(

3: Lenovo shows the parts but they don't sell it :(

4: The BIOS is apparently maintained on the main battery according to: https://www.youtube.com/watch?v=PGee7Q_T...

Thanks for the help tho and hopefully this'll all work out :).

Cheers,

Nick

(update: I just saw u said that i have to search the battery part online. I missed that. Oops

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Hi @np_f1_2021

p.22 of the hmm linked above, shows how to test the charger's output using a DMM (digital multimeter)

Wondering if the battery is even connected properly since the battery report doesn't work -presumably it doesn't show that it's charging then when the laptop is off and the charger is connected?

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@jayeff

It has a solid orange LED on both the pwr button and the side LED whilst the charge led is flashing white (On and off each second) whilst the laptop is on and the screen is open and on

I don't know if this laptop was tampered with or something as it was from a person who used this previously. This wasn't bought off ebay but was brought home in an attempt to fix it.

We tried to charge it for a few hours but it wouldn't charge above 0, the battery voltage is 1.244 based on HWiNFO64 and the cycle count is 1 (Somehow SMH). Unfortunately i don't have a multimeter on hand (I have a soldering iron though :-)

I literally just noticed that theres no time until charged thing under the windows battery icon in the menubar so that might help a bit

Highly appreciate the help

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I did order an ifixit mako toolkit for this job since 1: I don't have the appropriate screwdrivers because its Torx T4 (And i have as small as T6)

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@np_f1_2021

One last thing try uninstalling the Microsoft ACPI Compliant Method battery drivers in Device Manager and restart the laptop. Windows should "find" and reinstall them again, just in case there is a problem with them. To get to Device Manager press the Win key and x key (both keys together) and click on the Device Manager link.

When in device Manager scroll down to Battery then click on the >symbol next to the category to expand the list then right click on the Microsoft ACPI entry and click on Uninstall and follow the prompts.

Without a DMM it will be hard so the only thing to try for the moment is to replace the battery as the original is an unknown quantity (it may have totally failed - you don't know) and after it has charged (hopefully) check if it works OK.

if you can get hold of a DMM you can test the original battery and also see what the charging voltage is to make sure that it is correct and it may be the battery that is the problem before ordering a new one. Not the charger's supply voltage but the voltage that is actually being applied to the battery from the motherboard. Although if it has totally failed it won't try to charge anyway ;-(

Also what is the board number of the motherboard as printed on the motherboard.

Use the board number to hopefully find the schematics, i.e. search online for "(insert board number) schematics".

if the battery is not charging then the schematics will be needed to find out why.

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Nick P wird auf ewig dankbar sein.
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