Perfect 1 7141

A good battery compatible with my Zenbook ux52 (the ux42, 51 and 500 are probably consistent but hard to say for the UX31 etc ...) Battery allows me to perform a full charge + 1/2 from my pc to 4h autonomy at 10am (as much as some tablet).
A good compromise when you want to enjoy a good autonomy without invest 2000 euros in a MacBook or amputate performance with a tablet pc or less powerful and therefore less energy ...

Positive points:

a large capacity,
a clean brushed aluminum design (fits very well with my Zenbook).
lot of connectors for connecting the vast majority of today's electronic products.
a screen to monitor the (un) load.

negative points:

the first battery sent to me was grilled ... (replaced free of charge)
one USB port (second only delivers one Ampere impossible to plug anything belonging to me ... smartphone etc ...)
A bit pricey and a little mass (without being off-putting).
The connection is not perfect I had to twist slightly to avoiding false contacts.
does not damage my computer battery as did other low quality battery.