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With Smaller Size of Mobile Power, Comes Smaller Capacity?

Sep. 02, 2021


In this era dominated by mobile phones, once the phone runs out of power, our lives will also be at a standstill. As a result, rechargeable batteries have become a necessity in many people's lives. As it is too inconvenient to buy and carry them yourself, many people will choose to scan the QR code to rent a shared power bank. Are you curious about what exactly is inside a rechargeable battery? How does it store and charge electricity? And how do you get the "the smaller the better" with today's rechargeable batteries?

Battery composition

The main space inside the rechargeable battery is occupied by the storage medium, which is the core of the rechargeable battery. At present, there are two types of battery cells in circulation: 18650 lithium-ion batteries and lithium polymer batteries.

Lithium-ion batteries

Lithium-ion batteries were first developed by Sony in 1990 and are named after the non-aqueous liquid organic electrolyte used in their manufacture, which embeds lithium ions in graphite to form the negative electrode. Lithium-ion batteries have high energy density, high average output voltage, low self-discharge, superior cycling performance, can be charged and discharged quickly, have a charging efficiency of up to 100%, high output power, long service life and do not contain toxic or harmful substances, and are known as green batteries.

Lithium polymer batteries

Lithium polymer batteries are an improved version of lithium ion batteries and refer to a battery system in which at least one or more of the three elements of the battery (positive electrode, negative electrode and electrolyte) are made of polymer materials. As there is no excess electrolyte in the lithium polymer, performance is more reliable and stable than in conventional lithium-ion batteries, and safety issues such as leakage occur much less frequently. Lighter and thinner, lithium polymer batteries can be machined into various shapes to suit the actual needs.

RUIOO power bank

Are mini-chargers reliable?

If you are a heavy rechargeable battery user, you will have easily observed that over the years, rechargeable batteries have become more and more capacious and smaller and more fancy. Sometimes, when you look at these miniature rechargeable batteries with a nominal capacity, you can't help but wonder: are these mini rechargeable batteries really that powerful? Are they really reliable to use? Are there any safety risks?

According to the General Specification for Mobile Power Supplies for Information Technology Portable Digital Equipment regarding the logo and the effective output capacity at room temperature, which is the actual discharge capacity, the actual discharge capacity is the actual usable battery capacity converted from the battery inside the rechargeable battery. The most common way to accommodate more energy in the smaller "body" of a rechargeable battery is to use a higher quality storage cell. For example, lithium polymer batteries with higher capacity and faster charging are used.

While there are ways to make a rechargeable battery smaller, it is important to recognise that the electronic components inside a rechargeable battery that support its proper functioning must themselves take up a certain amount of space. A larger capacity rechargeable battery will inevitably be larger in size. These are all objective factors that limit the further miniaturisation of the size of rechargeable batteries. It is also true that there are some poor quality products on the market where the nominal capacity does not match the actual capacity.

For the average consumer, it is still advisable to choose a reliable brand with a larger battery capacity, which is safer in use.


According to the above introduction, we can understand that the rechargeable battery is composed of a battery cell, a boost circuit, a charging management circuit and a possible functional circuit, and also understand the secret of the gradual miniaturisation of the rechargeable battery. Finally, I would like to remind you to choose a regular brand of products when buying a rechargeable battery to avoid all kinds of "stepping on mines" or even safety accidents. Contact RUIOO to get reliable and big capacity sharing power banks.

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