The phone ( Samsung Galaxy A7) has a 3300mAh battery which doesn't seem unusual for a phone with a 6-inch display. However, Samsung's Experience UI is impressively well optimized for enhanced power efficiency. As an add-on, the A7 packs many battery saving tricks up its sleeve.
In real-life usage, it offers a decent battery backup with around 8 hours on a regular work day for me with mixed usage. My usage primarily included around 1.5 hours of voice calls, frequent peeking into social media accounts and WhatsApp, and sometimes 2-3 rounds of PUBG Mobile.
Overall it's a good phone in this price
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