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Sometimes when I do not use the original charger but a different one it would take less time to fully charge the device than the original charger would do. But I can feel that discharging rate is higher after using these chargers.

Is it true? If it is true, then what is the actual reason?

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I think not. faster charger actually put more energy into your battery (1A = 1W * 1V^-1). your battery's Voltage is at charging and discharging the same (or to be specific, it's rising while charging and dropping while discharging, but the same amount *), so basically the difference between the two chargers is the energy (A) which comes, and because of the same Voltage (V) the Power (W) must be different. if you discharge, the processor (and display,...) consumpts power (W), but the Voltage is still the same.

* what is not the same is how fast your battery would discharge in relation to the actual charging percentage (or, better known as slower charging at end of charging)

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Yes. There is a relation and the explanation is little long

Quoting from What is C Rate?, C Rate or Charging rate is defined as

C-rate is a measure that governs at what current a battery is charged and discharged. At 1C, a battery rated 1,000mAh charges at a current of 1,000mAh. In an ideal world the battery would be fully charged in 60 minutes. At 1C, the same battery discharges at 1,000mA.

Your "different" charger is probably charging at a higher C Rate and hence faster charging. Pushing higher current (to an extent) will expedite charging but not necessarily. For a detailed understanding, see this, which explains various stages of charging and a relevant extract

Increasing the charge current does not hasten the full-charge state by much. Although the battery reaches the voltage peak quicker, the saturation charge will take longer accordingly. With higher current, Stage 1 is shorter but the saturation Stage 2 takes longer. A high current charge will, however, quickly fill the battery to about 70 percent.

(Voltage is not to be misunderstood with the capacity of battery. Accepted answer here explains it well App showing battery charge based on its voltage. Fully charged our charge state indicator on mobile UI refers to voltage not capacity)

Since the battery is not really charged fully (at higher C Rate), it would discharge faster compared to a battery charged optimally using the OEM charger (lower C Rate) (actual discharge is related to capacity, which is lower in the former case)

The relation between charging and discharging rates is further clarified as (emphasis mine)

The battery capacity, or the amount of energy a battery can hold, can be measured with a battery analyzer...When discharging a battery with a battery analyzer capable of applying different C rates, a higher C rate will produce a lower capacity reading and vice versa.

As a thumb rule (with exceptions) slower charging results in slower discharge all other conditions being same. Related, quoting from BU-409: Charging Lithium-ion

Manufacturers of these (Li-Ion) cells recommend charging at 0.8C or less to prolong battery life.

  • What quotation does confirm your "yes"? – Άνδρας Jan 15 '16 at 10:06
  • No, it's not clear. The question is "if I charge my battery faster will it then discharge faster too?" Your quotation states that if I discharge my battery faster, it will have provide capacity. Any connection to charging rate is not mentioned. – Άνδρας Jan 15 '16 at 10:38

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