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ixon2018-10-28 12:18:52
Batteries
ixon, 2018-10-28 12:18:52

How to determine the battery capacity of headphones?

I bought wireless headphones. It turned out that they are quite quickly discharged. Obviously a bad battery. I opened it, hoping that there would be at least some kind of marking. It turned out, nothing, no volt-ampere characteristics, no volume. How to determine them with a multimeter?
In addition, the headphones do not have a name or model. But some components are somehow signed, is it possible to find the battery capacity among them by finding their datasheets?

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5 answer(s)
T
TyzhSysAdmin, 2018-10-28
@POS_troi

The real capacity can be found out by controlled discharge / charge of the battery - which is what the so-called "battery testers" do.
Simply put, a fully charged battery is connected to a load that provides a discharge current of 100mA (for example) and its discharge time is measured.

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pfg21, 2018-10-28
@pfg21

the easiest way is to find a new battery in size, the same battery will give about the same power.
the discharge characteristic of an old dead battery will not say anything about the real initial capacity.

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15432, 2018-10-28
@15432

Take any lithium battery that will fit. I pumped the headphones like this, putting a four times larger battery, worked for two weeks without charging. VAC will not give you anything, the usual 3.7v Chinese lithium.

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Viktor, 2018-10-28
@nehrung

CVC is a purely academic parameter that does not give anything for everyday practice. But the capacity, and even a multimeter ... They already answered how to do this. Therefore, I will add another method, indirect, which is only suitable for charging via USB. Connect your headphones for charging through such a device , and it will show you the charging capacity. Multiplying it by the efficiency of the battery, you get the discharge you need . The efficiency of a lithium battery is approximately 0.8 ... 0.95 (decreases as the service life increases).

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