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These are the Acer listed batteries compatible with the Nitro AN517-41 model, the AP21D8M is the same voltage and amperage battery so it will work, but the Li-ion AP21D8M battery should work with the Li-polymer adapter for the AP18E7M or 8M batteries listed by Acer, as Li-Po batteries can generally be charged by a Li-ion charger, but it is crucial to ensure that the charger's voltage and current output are compatible witch with these batteries they are, to avoid overcharging, which can damage the battery and even cause a fire.

To ensure 100% safety and effective charging I suggest that you use the proper listed battery for the Nitro AN517-41 laptop, as listed by Acer which is either the AP18E7M or 8M batteries, as the AP21D8M you can use, but it could be a fire hazard and can overheat the charger or the battery and there is a hazard of a fire. So I suggest that you return this battery and get them to send you the oem AN517-41 Acer listed battery like below, which is from the AN517-41 Acer service guide, so you can show them the table below. Good luck and hope this helps you out.

The listed batteries below for the Nitro AN517-41 model is part of this computer’s compatibility that is tested and verified by Acer’s internal testing department. All of its system functions are tested under Windows® 10 environment. Refer to the following lists for components, adapter cards, and peripherals which have passed these tests. Regarding configuration, combination and test procedures, please refer to the Nitro 5 AN517-41 Compatibility Test Report released by the Acer Mobile System Testing Department.

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Hi, the Nitro 5 AN515‑55 USB‑C port is data‑only. It doesn’t support DisplayPort Alt Mode or Thunderbolt, so you can’t send video through it to an external display. What you should get is an active USB3.0 graphics adapter like this one: https://www.amazon.com/Adapter-DisplayLink-Graphics-Outputs-Compatible/dp/B094G5JLNC?th=1

Note that you need to download the Diplaylink driver for this adapter

Hi @Jas99 – The AN515‑55’s USB‑C port is data‑only. No DP Alt Mode, no Thunderbolt, so no video over USB‑C. Use HDMI 2.1, or a USB 3.0 → HDMI/DP adapter with DisplayLink drivers.

Thanks @eGomes i think it got worse with a recent BIOS UPDATE, games run smothly on 1.31v BIOS update. I think the laptop only needs 1 or 2 more A to eliminate the problem.

Is there any way to contact the developers or a mailbox where I can send this as a BUG and they can address it? I think it's not that complicated to fix in an update, or this directly depends on the hardware and not the software or BIOS programming.

And again thanks for your response