The A5 continues to use the E12A’s highly effective MUSES02 + LME49600 OPAMP combo. According to Fiio, all major components utilize high-precision metal film resistors in order to keep improved channel balance and lower noise floor. A +/- symmetrical supplied power allows for the elimination of coupling capacitors, reduces distortion and increases dynamic range. The Output power is up to 800mW (at 32Ω), along with high/low gain switch, which makes the A5 capable of driving most of the headphones and earbuds in the market.
With the Fiio A5 you’re supposed to get longer battery life backed by smart rapid charging. The battery inside the A5 is an 880mAh 3S (three cells in series) battery. The A5 can automatically adjust the amount of current to the battery when charging by detecting your particular charging equipment. With a 5V/2A charger, the A5’s battery can be fully topped up in 2.5h only. With normal use, the A5 should last you for a lengthy 13 hours. Charging the unit while using it is perfectly fine btw, and you won’t hear any weird noises because of it.