Based on the description on their site, the controller includes a built-in battery: "8.39 Wh Li-ion battery, 35+ hours of gameplay… "
That was disappointing for me. Specially condidering the Steam Frame’s controllers make use of AA batteries: “One replaceable AA battery per controller, 40hr battery life”
AA Batteries might not be as convenient to use, but being able to replace them is a great advantage. All my Xbox360 controllers still work fine, but none of my PS3’ Dualshock 3s.
The official docking station could be used to recharge (rechargables) AA batteries so the functionality could remain the same.
You can get disposable for 12 cents a battery on amazon right now.
If I buy even 50 rechargeables I’m never getting money back.
I stand by my original comment. If you have a lot of toys you want disposable with long shelf life.
But I do agree if you have a toy that chews through batteries you want rechargeable. Most kids toys do not.