My now 8 years old tablet was in need for a new battery. The original battery from Fujitsu is more than €170, but even if I would be willing to spend that much: They have nothing in stock. Laptop Accessory had a great choice of laptop batteries and also had a battery for my Fujitsu Stylus. The parts had been in stock and costs only a fraction of the genuine part.
The battery is now 6 weeks in my old laptop and I can see more than 5 hours of usable time. This will give my old part another 3-4 years of usabme time. So much better than an iPad since it runs a "real" OS:)
Shipping was fast. The only downside was, that I had to pay custom fees. But even including the fee the battery was a bargain.