This thing keeps on going... and going... and going...
This battery is great. It last forever, charges way fast than the stock. If you haven't bought this. You should. Period.
Thunder Power Adrenaline 2600mah 2s
It's Taranis X9D upgrade time! The stock battery that comes with your Taranis X9D serves it's purpose. It'll get you flying with minimal setup time. But if you take FPV seriously, you'll soon find that the stock Taranis battery won't last you very long on a single charge!
Thunder Power has you covered! They've made this nifty LiPo battery pack just for the Taranis. It's a drop in upgrade - just pop the battery cover off, remove the stock battery and plug in the replacement! There's only one drawback - you can't use the charger that came with the Taranis to charge a LiPo, since it has a different chemistry. You'll have to take the battery out of the transmitter and charge it like you would charge your flight packs. This drawback is offset by the fact that you don't have to charge nearly as often with the improved battery!
NOTE: Don't use the stock FrSky charger. Use a proper LiPo charger instead. Remember to set up your Taranis battery alarm to the correct voltage!