Originally Posted by
matthoms Can you explain more? I don't follow fully.
As a reference, from your main post: 1.5 A vs 2 A charger ratings.
Lumia 1020's battery voltage is constant at 3.8 V, with the capacity at 2000mAh.
Charge time can then be calculated as follows: 2 Ah / (Current Rating in A) =
x hrs
This means that the higher current rating (amps) you use, the faster you charge.
However, higher current (amps) introduces higher losses (proportional to current squared). These losses are felt as heat; thus higher temperature. Higher temperature means that the Chemicals in the battery are more "excited", which causes battery degradation over time, - and even more battery losses -> battery discharges faster after the charging is done.
To simplify: Its better to use charger with lower current rating. (1.5 A) :)