An unnamed Chinese smartphone maker is reportedly developing a 14,000–15,000 mAh battery for a conventional smartphone, and the work has reached trial production, according to the well-known leaker Digital Chat Station. The leak says the phone would weigh about 250 grams, roughly the weight of a heavy flagship, and would not be excessively thick. No company, model name, or launch date has been disclosed, so the claims remain unconfirmed.
What you need to know
- Digital Chat Station says a battery of 14,000–15,000 mAh for an ordinary smartphone has moved to trial production.
- The phone is said to weigh around 250 grams. For comparison, the HONOR Power 2 (10,080 mAh) weighs 216 grams and the REDMI K100 (10,000 mAh) weighs 234.5 grams.
- The leaker did not name the manufacturer or reveal the battery chemistry. Commenters on the leak suggested a future HONOR Power model, but this has not been confirmed.
- The report mentions up to a week of use between charges. No finished phone or independent tests exist yet.
Concept rendering of a smartphone with a 15,000 mAh battery
10,000 mAh is no longer the ceiling
Until recently, a 10,000 mAh battery meant a bulky rugged phone built for construction sites or expeditions. Over the past year, however, Chinese manufacturers have managed to fit batteries of that size into relatively slim bodies. In 2026, phone makers have embraced very large batteries in ordinary Android smartphones, not just in rugged devices about two centimeters thick.
One example is the recently released REDMI K100. It has a 10,000 mAh battery, weighs 234.5 grams, and is 8.65 mm thick. It also has a Snapdragon 8 Elite chip, a 165 Hz AMOLED display, and 100 W charging.
REDMI K100 with a 10,000 mAh battery
The HONOR Power 2 goes further. It packs a 10,080 mAh battery into a 216-gram body that is less than 8 mm thick.
According to Digital Chat Station, one manufacturer now wants to go well beyond these phones with a battery of 14,000 to 15,000 mAh for a regular smartphone.
A large battery in a phone that is not a brick
The leaker says the battery has entered trial production. At this stage, engineers check the design, the assembly process, and whether the part can be mass-produced.
The most surprising claim concerns the device’s size. Despite a battery of up to 15,000 mAh, the phone is expected to weigh about 250 grams. The leaker also says the body will not be excessively thick.
A possible 15,000 mAh smartphone in hand
Here is how the phones compare:
| Device | Battery | Weight |
|---|---|---|
| HONOR Power 2 | 10,080 mAh | 216 g |
| REDMI K100 | 10,000 mAh | 234.5 g |
| Unnamed device (leak) | up to 15,000 mAh | about 250 g |
If the leak is accurate, battery capacity would rise by almost 50% over current 10,000 mAh phones, while weight would increase by only a few dozen grams.
How more energy fits in the same space
The source article credits much of the recent progress to the spread of silicon-carbon batteries. Traditional cells use anodes made mostly of graphite. Silicon-carbon cells can store more energy in a battery of similar size.
Silicon can hold much more lithium than graphite, but it has a drawback. Its volume changes significantly as the battery charges and discharges, which makes it harder to build long-lasting cells. Manufacturers are gradually refining anode materials and cell designs so they can benefit from silicon without seriously shortening battery life.
A silicon-carbon battery inside a smartphone
According to the source, this technology helped Chinese brands move from the once-typical 5,000–6,000 mAh to 8,000 mAh and then to 10,000 mAh. A 15,000 mAh cell brings new engineering problems. It has to fit inside a phone, operate safely, stay within reasonable temperatures, and charge at an acceptable speed.
The leaker has not revealed the battery’s chemistry. A silicon-carbon cell would be a logical choice, but it is not confirmed.
Could it last a week on one charge?
Longer runtime is the main reason to want a battery this large. The report says the developers are aiming for up to a week of use between charges. That figure should not be treated as a guaranteed result, because there is no finished production phone and no independent testing yet.
Real-world battery life will depend on the processor, the display, cellular signal quality, and how the phone is used. Using ordinary modern smartphones as a reference point, the source author offers these rough expectations:
- Calls, messaging, and occasional screen use: potentially several days without charging.
- Social media, web browsing, and video: noticeably longer than typical phones with 5,000 mAh batteries.
- Mobile gaming: faster battery drain, especially at high brightness and maximum performance settings.
A 50% increase in capacity does not guarantee a 50% increase in battery life. If the manufacturer pairs the battery with a more power-hungry processor or a bright, high-resolution display, part of the advantage would be lost.
The source suggests a battery this large could be especially useful when traveling, because users would need to look for an outlet less often. If the phone supports reverse charging, it could also partly replace a power bank.
One smartphone charging another
Who might make it?
The biggest unknown is the manufacturer. Digital Chat Station did not name the company, the model, or a possible launch date. Commenters on the leak suggested it could be a new generation of HONOR Power. The guess is plausible, since HONOR has already released the relatively light Power 2 with a 10,080 mAh battery.
However, nothing confirms that HONOR is behind the device. realme, Xiaomi, or another Chinese manufacturer could be working on something similar. Pricing is also unknown. The source notes that very large batteries are gradually ceasing to be limited to expensive phones; the HONOR Power 2, for example, launched in China at a relatively affordable price.
