when i looked at my battery consumption details and accubattery app details, TT app is nowhere to be found. This is how I know it is not consuming a lot of battery.
i have so many apps running in the background, TT app, google maps, google photos, whatsapp, telegram, pokemon go, google fit, to name a few. i also listen to music when on public transports. still this phone can last me when outside. it is impossible not to have apps running in the background. unless a particular app drains battery like crazy while in the background, it is not fair to say this or that app drains battery if it is behaving properly.
apps nowadays are very well behaved. even overnite with DND turned on, the F3 battery drain is around 0.5% per hr only, which to me is very acceptable.