1

This question is exact oposite of this question

Laptop specs lenovo G470

Battery specs

  1. Original ( which came with the original laptop i.e laptop in quetion)-

  • Power rating- 11.1V-48Wh (P=VI , so i=4.324)

  • Model number- L09M6Y02

  1. Replacement- (also original but from a different laptop)

  • Power rating- 10.8V-48Wh (P=VI , so i=4.444..)

  • Model number- L11L6Y01(3INR19/65-2)

Note-this battery has been sitting for almost 2 years without being used

Charger 20V-4.5A (for both)

So, is it safe to replace original 10.8v with the replacement battery?

Chemist
  • 214

1 Answers1

2

They're actually the same.

Lithium-ion and lithium-polymer cells have nominal voltages in the range of 3.6-3.8V. Their actual voltage fluctuates though, it can be slightly higher when the cell is charged. Your battery contains three such cells nominally rated 3.7V each, 11.1V in total because they're connected in series. The replacement battery has cells with nominal voltage of 3.6V, totaling 10.8V.

But as I said it's normal that voltage changes slightly throughout charge-discharge cycles and laptop's circuitry is prepared to handle it. It's actually using this relatively high voltage to produce a number of lower voltages, such as 5V, 3.3V and 1.2V. DC-DC converters responsible for delivering these have feedback signals which are compared to a common reference voltage and independent from input voltage.

I suppose the laptop circuitry would be good with anything between 10-12V and could probably go even lower safely.

The charger voltage is irrelevant, there's another step-down converter which produces voltages required to charge the battery and power the rest of the laptop while it's plugged in.

gronostaj
  • 58,482