B57 Battery

Updated September 20, 2026

Overview

Product sourcing insights & recommendations

27 来源

The term "B57 battery" typically refers to one of three distinct products, each serving a different market. The primary commercial interest currently centers on Xiaomi's BM57 flagship smartphone battery and the B57 generic smartwatch battery.

1. B57 Smartwatch Battery (Wearables)

This is a small lithium-polymer (Li-Po) cell used in affordable, generic smartwatches (e.g., HeroBand III, Colmi B57). Amazon

* Specifications: 180mAh capacity, 3.7V nominal voltage. Amazon

* Market Trends: The market is driven by the demand for low-cost fitness trackers. Consumer search volume is stable for generic "watch batteries" and "replacement kits" (approx. 35,560 monthly searches). Marketresearchfuture

* Insights: Wholesale prices are extremely low, often around $1.05/piece for bulk orders. Alibaba

2. Xiaomi BM57 Battery (Flagship Phones)

A high-performance battery designed for the Xiaomi Mi 11 Pro and Mi 11 Ultra. Amazon

* Specifications: 5,000mAh capacity, 3.87V, supporting 67W fast charging. Amazon

* Market Trends: There is a significant secondary market for "original capacity" replacements as these devices age. Search volume for the "Mi 11 Ultra" remains steady, though the specific BM57 model has lower direct visibility compared to the broader Mi 11 series.

* Insights: Sourcing prices for high-quality replacements range from $5.10 to $7.50/piece for MOQs of 2–10 units. Alibaba Alibaba

3. BCI Group 57 (Industrial/Automotive)

In industrial contexts, "57" refers to a BCI Group Size 57 lead-acid battery. Finning

* Application: Historically used in Ford/Lincoln/Mercury vehicles and small industrial engines. Finning

* Market Outlook: The lead-acid battery market remains a stronghold in North America, projected to grow by 1.9% in 2026. Batterycouncil

Market Comparison at a Glance

Feature	B57 Smartwatch	Xiaomi BM57	Group 57 (BCI)
Chemistry	Lithium-Polymer	Li-ion (Si-O Anode)	Lead-Acid
Capacity	180 mAh	5,000 mAh	60-90 Ah
Price (Wholesale)	~$1.05	$5.10 - $7.50	~$70 - $120
Primary Use	Fitness Trackers	Flagship Smartphones	Automotive/Industrial

Detailed product listings and supplier data for these categories are available in the attached files.

Would you like to find verified manufacturers for these batteries or calculate the landed cost for a bulk order?

Sources & References

27 sources cited · Verified industry data & reports

Smart B57 Battery

AliExpress

Original Genuine 5000mAh Replacement. Choose a battery with at least 900mAh capacity and a 3.33Wh rating for optimal performance. High Capacity (≥900mAh): Li- ...

Duotipa New Replacement Battery BM57 for Redmi Note ...

Amazon.com

Made of high quality Class A batteries. Built-in microchip prevents overcharging, over-discharging and overheating. Lithium Polymer batteries required.

Battery swap - BMW 5-Series Forum (G30)

Bimmerpost

But if you change from a 90/92/95AH battery to a 100AH-110AH battery (or vice versa) you will need to CODE the new battery first, then REGISTER ...

2011 Cat Batteries Cross Reference Guide

Finning Cat

Battery must recover to 25 charging amps within. 20 minutes and meet Industry Electrical Performance. Standards. Complete Discharge Test. • Battery must recover ...

REDMI BM57 BATTERY Replacement - Interlight

interlightus.com

AMPS: 4 - VOLTS: 14.4 WZ-GFV0-A. Now: $70.49 ea. Condition: New Volts: 14. Specs Volts: 14 MOL: 3.800 RATE: 57.6Wh AMPS: 4

Lenovo Replaceable Battery Self Repair

Lenovo

This landing page will help you find the steps for replacing your Lenovo device's internal battery. Replacement instructions for your device's battery are ...