1. Purpose

To ensure that all power bank products on JUMIA are marketed and described accurately and transparently, and to avoid negative reviews and returns from buyers due to errors in battery cell capacity, this guide is specially formulated. All listed power bank products must strictly comply with the mandatory descriptions provided in this specification.

2. Core Principle: Transparency in Capacity Declaration

Buyers are likely to confuse “total capacity of battery cells” and “actual output capacity”. Sellers must proactively and clearly inform buyers of the difference between the two.

2.1 Mandatory Explanatory Statement

Each power bank product description must include a relevant statement with the following or similar content:

【Important Capacity Notice】

• The Nominal Total Capacity (e.g., 10000mAh) of a power bank’s internal battery cell is measured at 3.7V.
• The standard charging voltage for devices like smartphones is 5V. During discharge, a voltage conversion and boost process occurs, which involves inevitable energy loss.
• Therefore, the Actual Effective Output Capacity of a power bank is approximately 60%-70% of its Nominal Total Capacity.
• Example: For a power bank with a nominal capacity of 10000mAh, its actual available capacity for charging devices is approximately 6000-7000mAh (specific value varies by device and usage environment).

3. Requirements for Product Specification Sheet

The specification sheet must list both “nominal capacity” and “rated capacity” to provide the clearest and unambiguous information.

Item	Description	Example (for a 10000mAh product)
Nominal Battery Capacity	The total capacity of the power bank’s internal battery (at 3.7V).	10000mAh / 3.7V (37Wh)
Rated Output Capacity	The minimum actual capacity the power bank can deliver at 5V. This is the most crucial performance indicator.	6500mAh / 5V (32.5Wh)
Input Port(s) & Parameters	e.g., USB-C, 5V/2A	USB-C, 5V/2A
Output Port(s) & Parameters	e.g., USB-A, 5V/2.4A; USB-C, 5V/3A	USB-A, 5V/2.4A; USB-C, 5V/3A
Dimensions & Weight	Physical specifications of the product.	Approx. 130mm* 70mm * 25mm, ~220g

4. Product Image Requirements

Images are an important way for buyers to verify information and must be clear and accurate.

Prohibited Behavior: It is strictly forbidden to use misleading large fonts to highlight “10000mAh” on all referenced images, while labeling “rated capacity 6500mAh” in extremely small, unrecognizable fonts.

5. Compliance and Review

• Violation Handling: Any product found to have misleading, false, or concealed rated capacity information will be rejected from listing on JUMIA or removed from the shelves until the seller provides corrected information that fully complies with the requirements of this guide.
• Responsibility: Sellers are responsible for ensuring the authenticity of the information they provide and shall be liable for all buyer negative reviews, complaints, and returns caused by false information.