Question 3rd party batteries for controllers

[alchemystical]

Was looking around trying to get a high capacity battery for my Wii U Gamepad and noticed that all the official ones are telephone numbers whilst all the 3rd party ones are under a tenner? Tempted to give one of the cheaper ones a punt, anyone used one before in any of their controllers and if so is it worth paying 5x more for the real deal or do they do the job just as well?

Thanks

 

[DarenD]

Can't go far wrong with Uniross 2600. We have 8 on rotation, 4 in use 4 on charge for 2 controllers