Key Factors Affecting the Battery Life of Polymer Batteries

The battery life of electronic devices fundamentally depends on the balance between the "effective electrical energy the battery can release" 

and the "power consumption per unit of time," continuously influenced by the environment and maintenance. These factors can be 

categorized into four main types, with varying degrees of impact across different products.

I. Intrinsic Battery Factors

These factors determine the upper limit of battery life and are independent of the device type, relating only to the cell's design, manufacturing, 

and aging.

1.Rated Capacity and Energy Density: Rated capacity (mAh, Wh) is the baseline for power storage capability. Energy density determines 

the stored power per unit volume or weight, directly impacting the upper limit of portable device battery life. This is affected by cell materials 

and manufacturing processes. State of Health (SOH) degrades with charge cycles, reducing usable capacity and shortening battery life over 

time.

2.Internal Resistance: Current passing through internal resistance generates heat loss. The higher the resistance, the less effective output 

power. For high-power devices with high-current discharge, the negative impact of internal resistance is amplified. Additionally, resistance 

changes with cell aging and temperature.

3.Self-Discharge Characteristics: Batteries consume power even when idle. The monthly self-discharge rate at room temperature is 1–5%. 

High temperatures and full-charge storage accelerate self-discharge, significantly reducing battery life after long periods of inactivity, notably 

affecting standby devices.

4.Cycle Aging: As charge/discharge cycles accumulate and usage time increases, permanent capacity degradation occurs. This is the 

fundamental reason for shorter battery life over long-term use.

II. Device System Power Consumption

The speed at which a device consumes power directly determines the length of battery life and is the main reason for differences in battery 

life across electronic products.

1.Hardware Power Consumption: Core power consumption is concentrated in three components:

（1）Power Execution Components: Motors, actuators, etc., are the main power consumers in high-power devices.

（2）Computation/Display Components: CPUs, GPUs, and screens are the main power consumers in medium and large devices.

（3）Communication/Peripheral Components: Wireless modules, sensors, etc., significantly increase power consumption when active.

（4）Software Power Consumption: For IoT devices, the frequency of data reporting and network connection strategies directly affect 

standby battery life.

（5）Discharge Rate and Operating Modes: High-rate, high-current discharge (high-performance, heavy-load conditions) reduces the 

actual usable capacity of the battery, shortening battery life. Conversely, energy-saving and standby modes (low-rate discharge) can 

extend battery life.

III. External Environmental Factors

The environment affects battery life by altering battery performance and device power consumption, with temperature being the core factor.

1.Ambient Temperature: The optimal operating temperature is 20–25°C. Low temperatures cause a sharp increase in internal resistance 

and a reduction in usable capacity, leading to a sudden drop in battery life. High temperatures accelerate permanent battery aging and 

may increase device cooling power consumption, shortening battery life in a double blow.

2.Other Environmental Conditions: Extreme humidity and dust may cause device leakage or short circuits. Strong electromagnetic 

interference and high-altitude low air pressure indirectly increase power consumption or exacerbate high-temperature effects, though 

their impact on battery life is generally minor.

IV. Usage and Maintenance Habits

Poor habits accelerate battery aging, continuously degrading battery life, and apply universally across all device categories.

1.Charging/Discharging Habits: Frequent deep discharges, long-term overcharging, and prolonged use of mismatched high-power fast 

charging accelerate cell damage and capacity degradation.

2.Storage Conditions: For devices in long-term storage, keeping them fully charged or fully discharged in high-temperature, humid 

environments accelerates battery aging. It is recommended to store with a charge level of 40–60% in a cool, dry place.

3.Physical and Load Protection: Battery compression, drops, and punctures cause a sharp increase in internal resistance and capacity 

reduction. Long-term device operation beyond its load capacity shortens immediate battery life and accelerates aging.

Battery Life Improvement and Maintenance Recommendations

Immediate Improvement: Turn off unnecessary hardware functions, switch to energy-saving mode, and avoid using the device in extreme 

temperatures.

Long-Term Maintenance: Avoid deep discharges and long-term overcharging. For stored devices, periodically recharge to 40–60% and 

strictly prevent physical damage and overloading.