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lenovotv
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Message 1 of 26

Will One damage P73 if one uses a 175W and 235W chargers interchangably?

Will the battery lifespan be shortened? Is it bad for the battery and the computer if we do that?

Guru
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Message 2 of 26

Re: Will One damage P73 if one uses a 175W and 235W chargers interchangably?

What is the scenario for each? Which internal display? (4k IPS? / 4K OLED?)

1. Charging only: No issues.

2.Using the internal GPU: either works fine.

3. Using dGPU (RTX....), 175W may not supply enough power to prevent the battery from being discharged.


P53 XEON 2276 BIOS 1.16 OLED UHD 4K Multi-touch display, 96GB RAM, RTX5000, RAID 1, 1TB x 2 Samsung PM981, 1TB PM981, WWAN
P70 XEON 1505, BIOS 2.32, 4k Display, 64GB, M3000M NVIDIA GPU, RAID1 1TB Samsung PM981 PCIe-NVMe SSD x 2, 2x Samsung 850 Pro 1TB SSD. EM7455 WWAN
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ve2mrx
802.11n
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Message 3 of 26

Re: Will One damage P73 if one uses a 175W and 235W chargers interchangably?

Did your system come with 175W or 235W?

 

If your machine came with 235W power adapter, it won't work with a 175W one. If a recipe needs 4 cups of water and you only have 3 cups, it won't work. But if your machine came with a 175W one, 235W will work like needing only 3 cups of water but having 4 cups on hand. You just have unused power.

 

Keep in mind the voltage (V or VDC) of ANY adapter you use needs to match the one supplied with your machine or you risk burning stuff up. Obviously, using an adapter not recommended by Lenovo could void warranty.

 

P=IxV, so 235W = 12.11A x 19.4V and 170W = 8.76A x 19.4V (Those are standard Lenovo Slim-tip power adapters).

 

Martin

I'm a user, NOT a Lenovo employee. If my post helped, consider giving me a Kudos. If I solved your issue, please mark it as Solved.
P52 I7-8750H P1000 FHD 16GB 512GB-SSD 1TB-HDD
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Message 4 of 26

Re: Will One damage P73 if one uses a 175W and 235W chargers interchangably?

I think in the long term the battery because it would have to act as a PSU, when the system is under high load, that it is possible in the long term that using a lower specification power adapter than recommended might potentially be detrimental to battery lifespan; it will have to work harder to support the system.

 

Again, sorry for the hijack, but we are interested in the information I requested in another of your posts, to date you have not provided that which has been requested. This is the third request.
https://forums.lenovo.com/t5/ThinkPad-P-and-W-Series-Mobile/QC-issues-with-P53-RTX4000-8GB-4K-screen...

 

Andy

 

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Guru
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Message 5 of 26

Re: Will One damage P73 if one uses a 175W and 235W chargers interchangably?


@ve2mrx wrote:

Did your system come with 175W or 235W?

 

If your machine came with 235W power adapter, it won't work with a 175W one. If a recipe needs 4 cups of water and you only have 3 cups, it won't work. But if your machine came with a 175W one, 235W will work like needing only 3 cups of water but having 4 cups on hand. You just have unused power.

 

Keep in mind the voltage (V or VDC) of ANY adapter you use needs to match the one supplied with your machine or you risk burning stuff up. Obviously, using an adapter not recommended by Lenovo could void warranty.

 

P=IxV, so 235W = 12.11A x 19.4V and 170W = 8.76A x 19.4V (Those are standard Lenovo Slim-tip power adapters).

 

Martin


Things are not quite that bad. If the system needs more power, then the battery will supplement the power requirements if the PSU is too small. The P73 may come with either PSU depending on the dGPU.


P53 XEON 2276 BIOS 1.16 OLED UHD 4K Multi-touch display, 96GB RAM, RTX5000, RAID 1, 1TB x 2 Samsung PM981, 1TB PM981, WWAN
P70 XEON 1505, BIOS 2.32, 4k Display, 64GB, M3000M NVIDIA GPU, RAID1 1TB Samsung PM981 PCIe-NVMe SSD x 2, 2x Samsung 850 Pro 1TB SSD. EM7455 WWAN
P1. BIOS 1.24,Xeon Processor, 32GB, PM981 1TB x 2, RAID1
T470s, 16GB RAM, BIOS 1.10, i7-7500, WQHD display, 512GB PM961 PCIe NVMe SSD
ve2mrx
802.11n
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Message 6 of 26

Re: Will One damage P73 if one uses a 175W and 235W chargers interchangably?

@harrisb
Yes, but it's a short term solution, no?

I mean, that is until the battery has discharged and the system no longer can smooth out power demand using it?

It could be possible if visiting some place for a few hours, but at some point you will need the full power supply, no? I wrote assuming it was for a longer-term use.

I'd think that if your system came with 235W and you don't ever need more than 170W, your system is over-powered for your needs ;-) But that's for another thread or PMs!

Martin
I'm a user, NOT a Lenovo employee. If my post helped, consider giving me a Kudos. If I solved your issue, please mark it as Solved.
P52 I7-8750H P1000 FHD 16GB 512GB-SSD 1TB-HDD
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agazpp
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Message 7 of 26

Re: Will One damage P73 if one uses a 175W and 235W chargers interchangably?

I've got P73 with 6c Xeon and RTX 5000;

 

It works just fine with 175 watt adapter as long as you don't load dGPU all the way; If you do it will go limp about every second. GPU-Z will report thermal/power throttle and GPU will drop to 300mhz then will jump back to normal and crash again; 

 

Otherwise it charges just fine; Had no problem loading up CPU to 100%; Use it right now in fact ...

 

It won't work if you connect 175 watt adapter to Docking Station (in addition to 65watt) however for whatever reason; You'll get insufficient power warning; It won't charge;

 

As far as damaging componets I am not sure ...

Alexander Krasnyanskiy
Minneapolis, MN;
Let's go Bowling!
ve2mrx
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Message 8 of 26

Re: Will One damage P73 if one uses a 175W and 235W chargers interchangeably?

@agazpp
Dock wise, maybe that's due to the fact that there is an "ID" pin (connected to a resistor) in the adapter and the system tells the Dock it expects 230W. The Dock sees it's 170W and tells the system?

 

There are 170W and 230W versions of the ThinkPad Thunderbolt 3 Workstation Dock and as far as I can see online the dock unit is the same, only the power supply is different (and I saw both at the same price!).

 

For the "size" of the power adapter, I would expect a 170W one to work as long as the peak power drawn does not exceed 170W, which I assume includes light use on a charged battery, like you described. The system obviously does not normally run at max power input all the time, but as a simple answer to a complex question, 170W should not be the first choice for a system that supplies 235W. You should get what the system comes with, else you risk painting yourself in a computing corner.

 

Of course, my advice does not apply to people knowledgeable in electronics, it should already be clear to them what you can and cannot do with less supply than officially needed. I used to compensate a weak hamradio power-supply with a lead-acid battery in-line (and a big capacitor). The battery compensated for peak power demand while transmitting and would recharge while receiving. The laptop battery CAN smooth out the load, at the expense of wear due to constant charge/discharge cycles. The preferable solution is to have the right power source to begin with instead of jerry-rigging something to "just make it work". But what is the fun in that!

 

In the end, it's your pocket, either you pay up-front for the power adapter that will always fulfill the power need, or you pay later by limiting your productivity, replacing batteries earlier or speed up the machine's aging with more electrical stresses. You just can't beat the laws of physics or chemistry.

 

That simply means you should know what you need and what possible consequences you choose. Considering they are about 20$US apart on Lenovo's website (50$US for the docks, 13.5% of the price), I know what I would buy: Lenovo 230W, even if my system is 170W-needing.

 

Martin

I'm a user, NOT a Lenovo employee. If my post helped, consider giving me a Kudos. If I solved your issue, please mark it as Solved.
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agazpp
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Message 9 of 26

Re: Will One damage P73 if one uses a 175W and 235W chargers interchangeably?

Dock stations are the same it seems ( 175 wt vs 230 wt );

I ordered 175 watt version because it was the only one available with overnight shipping to Spain and I really only needed a dock; Charger is an extra bonus;

Everything works ok if I feed 230 watt charger that came with laptop through dock;

Alexander Krasnyanskiy
Minneapolis, MN;
Let's go Bowling!
lenovotv
Token Ring
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Message 10 of 26

Re: Will One damage P73 if one uses a 175W and 235W chargers interchangably?

The price difference between the 230W and 175W AC adapters is small. Money is not a factor here. I am considering the 175W adapter because it is lighter and the power cord is more flexible. So, it is better to carry it along with the heavy computer if I do not plan to use the dGPU while on the go. However, if using the 175W and 230W adapters interchangably could negatively impact the battery or the laptop, perhaps just better to get an extra 230W adapter instead?

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