What is the correct battery specification for A515-54-50BT?

John110138
John110138 Member Posts: 7

Tinkerer

edited February 6 in Aspire Laptops

Output voltage, charge rating in Wh and charging voltage.

I found an option with 11.4V and 2200mAh and another with 15.2V and 2750mAh. Which one should I go for?

Best Answers

  • Alejandro_AC
    Alejandro_AC ACE Posts: 13,313 Trailblazer
    Answer ✓

    In theory yes for the most basic devices, but performance is lower when working on battery.

    All the best.

    • Haga clic en "Me gusta" si mi respuesta fue útil o márquela como solución si se resolvió, ¡gracias!
    • Colaborador pro bono, no trabajo ni hablo en nombre de Acer
    • Please click "Like" if my answer was helpful or mark it as solution if it was solved, thanks!
    • Pro bono contributor, I do not work or speak on behalf of Acer
    • MVP de MSFT (2003-21) & Windows Insider & (alezmvp)
  • John110138
    John110138 Member Posts: 7

    Tinkerer

    edited February 10 Answer ✓

    I have done some research, and apparently, a lithium-ion battery will have a charging voltage equal to 4.2~4.3 V times the number of cells. A 3-cell battery will have a 12.6 V input tension, a 4-cell, 16.8 V. Given that the laptop is required to function in addition to the battery being charged, the output tension from the charger must exceed the battery's input charging tension, otherwise it wouldn't charge as the laptop would draw as much energy from the battery as was being replenished.
    My charger will output 19 V while it is able to withstand 2.37 A of current being drawn from it, that yields 45 W of total maximum output energy. Since the battery's circuit will regulate its current input by resistance given a maximum 17.2 V tension, and at normal operating capacity the laptop draws about 3.9~8 W, we can derive the charging tension by subtracting from the total energy output by the charger, the energy used by the laptop:

    Battery input tension = (45W - 3.8W) ÷ 45 × 19V = 17.39V. That's merely 1.1% above nominal with the laptop idling.

    It exceeds nominal maximum input tension, but not by much. Charging the battery without the laptop drawing at least some of the tension could perhaps be dangerous, but nowhere near as a 3-cell battery since the input overvoltaging would only be 10.4% above nominal (probably withing tolerance range) while a 3-cell battery would have its maximum nominal input tension exceeded by 50,8% (!!!). No wonder that thing puffed up so much close to blowing up haha.
    Welp, case closed. Pay attention the number of cells in the battery if you can't figure out the input tension to compare with the charger.

Answers

  • Alejandro_AC
    Alejandro_AC ACE Posts: 13,313 Trailblazer

    Hi @John110138 I leave you the information from the service manual:

    All the best.

    • Haga clic en "Me gusta" si mi respuesta fue útil o márquela como solución si se resolvió, ¡gracias!
    • Colaborador pro bono, no trabajo ni hablo en nombre de Acer
    • Please click "Like" if my answer was helpful or mark it as solution if it was solved, thanks!
    • Pro bono contributor, I do not work or speak on behalf of Acer
    • MVP de MSFT (2003-21) & Windows Insider & (alezmvp)
  • John110138
    John110138 Member Posts: 7

    Tinkerer

    So the a515-54 series can take both the 11.4V and 15.2V batteries?

  • StevenGen
    StevenGen ACE Posts: 11,987 Trailblazer

    The below are all the specs of the batteries for the Aspire A515-54 laptop.

    If this answers your question and solved your query please "Click on Yes" or "Click on Like" if you find my answer useful👍

  • John110138
    John110138 Member Posts: 7

    Tinkerer

    edited February 7

    Jesus, its so frustrating. How come Acer doesn't have well cataloged parts specification for their models?

    I no longer have the original battery and I don't have access to these murata and lgc batteries because they have to be imported and the import duties are absurd in my country.

    Im sorry if I sound arrogant, but I need to know just two simple things: is the output voltage 15.2V or 11.4V, and which if them take 19V as charging voltage (thats what my charger outputs).

    It's very concerning because I bought the wrong battery as Acer doesn't specify the specs explicitly and 2 months later, one of the cells has a huge bulge on it and was close to exploding (i found out because the touchpad stopped clicking due to distortion), because the charging voltage for it was 12.6V while my charger was outputting 19V.

    I hope now you understand my concern with safety and also with not damaging the internal components by overvoltaging them.

    For Acer, it's like the customer ceases to exist and becomes unimportant once the sale is settled.

  • Alejandro_AC
    Alejandro_AC ACE Posts: 13,313 Trailblazer
    edited February 7

    According to the screenshot in the service manual it is 15.2v.

    All the best.

    • Haga clic en "Me gusta" si mi respuesta fue útil o márquela como solución si se resolvió, ¡gracias!
    • Colaborador pro bono, no trabajo ni hablo en nombre de Acer
    • Please click "Like" if my answer was helpful or mark it as solution if it was solved, thanks!
    • Pro bono contributor, I do not work or speak on behalf of Acer
    • MVP de MSFT (2003-21) & Windows Insider & (alezmvp)
  • John110138
    John110138 Member Posts: 7

    Tinkerer

    Oh my... and the one I had installed was 11.4V or something. Can the laptop even function with a lower voltage?

    Everything is so confusing.

  • Alejandro_AC
    Alejandro_AC ACE Posts: 13,313 Trailblazer
    Answer ✓

    In theory yes for the most basic devices, but performance is lower when working on battery.

    All the best.

    • Haga clic en "Me gusta" si mi respuesta fue útil o márquela como solución si se resolvió, ¡gracias!
    • Colaborador pro bono, no trabajo ni hablo en nombre de Acer
    • Please click "Like" if my answer was helpful or mark it as solution if it was solved, thanks!
    • Pro bono contributor, I do not work or speak on behalf of Acer
    • MVP de MSFT (2003-21) & Windows Insider & (alezmvp)
  • John110138
    John110138 Member Posts: 7

    Tinkerer

    It's weird. Not even the website I used in the past for buying replacement parts can give me a decisive answer.

  • Alejandro_AC
    Alejandro_AC ACE Posts: 13,313 Trailblazer
    • Haga clic en "Me gusta" si mi respuesta fue útil o márquela como solución si se resolvió, ¡gracias!
    • Colaborador pro bono, no trabajo ni hablo en nombre de Acer
    • Please click "Like" if my answer was helpful or mark it as solution if it was solved, thanks!
    • Pro bono contributor, I do not work or speak on behalf of Acer
    • MVP de MSFT (2003-21) & Windows Insider & (alezmvp)
  • John110138
    John110138 Member Posts: 7

    Tinkerer

    Just got my new battery replacement, but they sent a "AC14B8K" model instead of the AC14B18K. The good thing is that the AC14B8K has 3600mAh capacity at 15.2V, which yields 55Wh in total held charge.

    The thing is that there are no markings specifying charging voltage. Does anyone have any documentation on the charging voltage for this battery model?

  • John110138
    John110138 Member Posts: 7

    Tinkerer

    edited February 10 Answer ✓

    I have done some research, and apparently, a lithium-ion battery will have a charging voltage equal to 4.2~4.3 V times the number of cells. A 3-cell battery will have a 12.6 V input tension, a 4-cell, 16.8 V. Given that the laptop is required to function in addition to the battery being charged, the output tension from the charger must exceed the battery's input charging tension, otherwise it wouldn't charge as the laptop would draw as much energy from the battery as was being replenished.
    My charger will output 19 V while it is able to withstand 2.37 A of current being drawn from it, that yields 45 W of total maximum output energy. Since the battery's circuit will regulate its current input by resistance given a maximum 17.2 V tension, and at normal operating capacity the laptop draws about 3.9~8 W, we can derive the charging tension by subtracting from the total energy output by the charger, the energy used by the laptop:

    Battery input tension = (45W - 3.8W) ÷ 45 × 19V = 17.39V. That's merely 1.1% above nominal with the laptop idling.

    It exceeds nominal maximum input tension, but not by much. Charging the battery without the laptop drawing at least some of the tension could perhaps be dangerous, but nowhere near as a 3-cell battery since the input overvoltaging would only be 10.4% above nominal (probably withing tolerance range) while a 3-cell battery would have its maximum nominal input tension exceeded by 50,8% (!!!). No wonder that thing puffed up so much close to blowing up haha.
    Welp, case closed. Pay attention the number of cells in the battery if you can't figure out the input tension to compare with the charger.