If customers are looking for a cheap phone under 4 million VND with a solid battery for daily use, below are the products you should consider in 2025.
1. OPPO A5x phone
If you are looking for one phone Really cheap “buffalo” batteries, then OPPO A5x phone is an option not to be missed. With a battery capacity of up to 6000 mAh, the device easily meets the needs of continuous use from 1.5 to 2 days, even up to 3 days if used with moderate intensity. Comes with 45W fast charging technology, helping the device charge 50% of the battery in just 39 minutes – an extremely impressive charging speed in the low-cost segment.
Not only does it stand out in terms of battery, OPPO A5x is also equipped with a trendy design, eye-catching color changing effect on the back, MIL-STD 810H military standard durability and IP65 water and dust resistance. The device has a thickness of only 7.99mm, the frame is flat but softly curved, providing a comfortable grip.
Regarding the screen, this new 2025 OPPO phone uses a 6.67-inch IPS LCD panel, brightness up to 1000 nits, 90Hz refresh rate, for a smooth and easy-to-see visual experience even under strong light. The screen is also protected by AGC DT-Star D+ tempered glass and supports operation even when wearing gloves.
The performance of the device is also very formidable when using the Snapdragon 6s Gen 1 (4G) chip manufactured on the 4nm process, reaching more than 560,000 Antutu 10 points – surpassing Redmi Note 14 4G. Comes with 4GB RAM and expanded virtual RAM, enough to handle popular games like Lien Quan Mobile or PUBG Mobile.
About camera. cameraOPPO A5x is equipped with a 32MP main camera, supports smart AI with features such as background separation, object removal or increased sharpness. The 5MP selfie camera also meets the daily needs of taking photos and video calls. In addition, the device also has NFC, infrared sensor, dual SIM tray that supports memory cards, providing a convenient and complete experience for common users.
OPPO phone price A5x 4GB/64GB is currently only 3.6 million VND.
2. Samsung Galaxy M15 5G phone
Not a new phone like the A5x, Samsung Galaxy M15 5G is an old smartphone but is still widely sold on the market. The price of the genuine Samsung M15 5G phone is currently reduced in stores to only 3.3 million VND with 4GB RAM and 128GB internal memory.
Samsung Galaxy M15 5G phone (Photo: Samsung).
With a 6000 mAh battery, Galaxy M15 5G is also a cheap phone with a huge battery that easily meets usage needs all day long without worrying about running out of battery. For common users, the device can last up to 2 days before needing to be recharged. Besides, the device also supports 25W fast charging via USB-C port, helping to shorten charging time and ensure flexibility in daily use.
Not only outstanding in battery life, Galaxy M15 5G also possesses a powerful configuration thanks to the MediaTek Dimensity 6100+ chip, manufactured on the 6nm process, for stable performance and the ability to play games like PUBG Mobile, Call of Duty or Lien Quan Mobile smoothly. AnTuTu performance score reached more than 410,000 points, an impressive number in the price range of less than 4 million VND. The device also supports 5G connection High speed, helps surf the web, watch videos and access social networks completely smoothly.
Galaxy M15 5G is also equipped with a sharp 6.5-inch AMOLED screen, Full HD + resolution, 90Hz refresh rate and maximum brightness of up to 800 nits, providing a vivid and smooth visual experience even when used outdoors. Dragontrail Pro Glass tempered glass layer makes the screen more durable against impacts and scratches.
Regarding the camera, this cheap phone with strong battery has a cluster of three rear cameras with a 50MP main sensor, accompanied by a 5MP wide-angle camera and a 2MP depth camera, supporting 1080p video recording. The 13MP front selfie camera satisfies the needs of taking selfies, video calling and livestreaming, along with smart beauty filters.
Although the design is not too flashy, the Galaxy M15 5G has a practical, easy-to-hold style with a lightly curved frame and weight of only 217g. The device also has built-in NFC, side fingerprint sensor, 3.5mm headphone jack and dual SIM tray, fully meeting the needs of common users who love convenience.
3. Vivo Y19s Pro phone
Just sold in the Vietnamese market in June 2025, phone Vivo Y19s Pro It is also one of the cheap smartphones with long battery life worth buying today. The device possesses a super powerful 6000mAh battery, allowing users to comfortably use all day long without worrying about running out of battery. Combined with 44W fast charging, Vivo Y19s Pro is both durable and saves waiting time – an extremely rare advantage in the price range of 4 million VND.
Vivo Y19s Pro phone (Photo: Vivo).
The Vivo Y19s Pro phone has a trendy design with a flat frame, a smooth back and an eye-catching color-changing LED camera. The device is only 8.1mm thin, firm to hold and comfortable for long-term use. Vivo also does not forget durability when equipped with MIL-STD 810H military standards, IP64 water and dust resistance, and shock resistance reinforced at every corner of the device.
In terms of performance, this cheap phone with strong battery is equipped with Unisoc T612 chip, up to 8GB RAM + expanded virtual RAM, for a total capacity of up to 16GB – more than enough to handle multitasking and light to medium gaming. 128GB internal memory, supporting additional 1TB expansion via memory card, helps users comfortably store photos, videos, games or documents.
6.68-inch IPS LCD screen, HD+ resolution, 1000 nit brightness and 90Hz refresh rate, for a smooth surfing experience and clear display even in sunlight. The machine is also equipped loudspeaker High-capacity dual-channel system, helps make sound loud and clear even in noisy places. Vivo Y19s Pro has a 50MP main camera cluster, supporting many AI features such as object removal, photo enhancement, super night photography… 5MP front camera comes with an Aura light ring to support impressive selfies in all lighting conditions.
Vivo Y19s Pro 4GB/128GB phone price is currently only from 3.1 million VND.
4. Realme C71 phone
Realme phone C71 This is the last model we want to mention in the list of cheap smartphones with strong batteries. Featured with a super huge 6300mAh battery, allowing users to comfortably watch videos, play games, study online or work all day long, even needing 2-3 days to charge if used moderately. In particular, 45W fast charging helps you recharge the battery extremely quickly – convenient in situations where you need to move quickly or when you forget to charge.
Realme C71 phone (Photo: Realme).
Realme C71 also impresses with its 6.67-inch IPS LCD screen, smooth 120Hz refresh rate. Unisoc T7250 processor combined with expandable RAM up to 12GB and 128GB internal memory helps the machine handle multitasking smoothly. The 50MP main camera cluster supports many AI features such as removing objects, separating the background, and clarifying blurred images to help you capture every sharp moment.
In addition, this cheap phone with strong battery also has a speaker with 400% volume, 7.79mm ultra-thin design and ArmorShell shell that meets military shockproof standards, IP64 water resistance, extremely suitable for students, shippers or older users who need a durable device – strong battery.
Realme C71 4GB/128GB phone price is currently only from 3.5 million VND
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