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What problem will occur when mixed use batteries of different capacities and different voltages?
When mix use batteries of different capacities and different voltages, leakage or short circuit may occur. These problems occurred because some of the batteries will be over charged and some others are not charged to full capacity. When these batteries are discharged together, the batteries with full capacity cannot be fully discharged while the other batteries with low capacity will be over discharged. In this way, the batteries will be damaged and leakage or short circuit low (zero ) voltage will occur.
What is the depth of discharge (DOD)
DOD refers to the percentage that the capacity discharged account for the nominal capacity of the battery.
-Reducing the DOD can greatly prolong the service life of storage battery.
-vercharging and over discharging will shorten the service life of the battery.

What is nominal capacity?
Nominal capacity refers to the least capacity that should be discharged under certain charging or discharging condition. For example, the nominal capacity for HCP603450 is 1000mAh, it means when this battery is charged with 0.1C=100mA for 16 hours, rest 1~4 hours, then discharge with 0.2C=200mA to 3.0V, the capacity discharged should be no less than 1000mAh (Ambient temperature: 20±5℃)
Where Li-ion polymer batteries should be stored?
Li-ion polymer batteries should be stored in a place not exposed to direct sunlight. Make sure the area is dry and has minimal temperature variation. Storage in areas subject to high temperatures, humidity or rain may cause deterioration in battery quality and durability. To avoid short circuiting batteries during storage, be sure that the positive and negative terminals do not come in to contact with each other.
What is the battery internal resistance?
One of the urgent requirements of a battery for digital applications is low internal resistance. Measured in milliohms (mΩ), the internal resistance is the gatekeeper that, to a large extent, determines the runtime. The lower the resistance, the less restriction the battery encounters in delivering the needed power bursts. A high mΩ reading can trigger an early 'low battery' indication on a seemingly good battery because the available energy cannot be delivered in an appropriate manner. In HONCELL, we produce the massive Li-ion polymer batteries with little internal resistance. Please refer to our specified datasheet of each model for details of its resistance.
What will happen if the batteries with different capacity are packed together?
If the batteries with different capacity or new and old batteries are used together, leakage, zero voltage and so on might happen. If the battery are rechargeable and are being charged, some batteries is overcharged and other batteries is not in full charged state. During the discharge, some batteries can not discharge fully and other batteries might over discharge. This way, the battery will be damaged.

What is the short circuit?
If the positive and negative terminals come into contact with each other or with a metal object, this can cause a short circuit, generating heat. If the batteries are stacked on top of each other or mixed, the resulting short circuit can lead to heat generation, leakage, bursting and, eventually fire. Do not short circuit Li-ion polymer batteries.
What is the primary battery and secondary battery?
The primary battery refers to the battery that can only discharge and is not rechargeable while the secondary battery talks of the rechargeable battery that can be charged and used in duty-circle operation.
What is the package of Li-ion polymer batteries?
The Li-ion polymer battery is almost exclusively packaged in the so-called 'pouch cell'. This cell design made a profound advancement in 1995 when engineers succeeded in exchanging the hard shell with flexible, heat-sealable foils. The traditional metallic cylinder and glass-to-metal electrical feed-through has thus been replaced with an inexpensive foil packaging, similar to what is used in the food industry. The electrical contacts consist of conductive foil tabs that are welded to the electrode and sealed to the pouch material.

What is the memory effect?

In general, Li-ion and Lipo batteries have no memory effect. We are talking of some types such as nicd batteries, and to a lesser extent Ni-MH batteries, suffer from what's called the "memory effect". What this means is that if a battery is repeatedly only partially discharged before recharging, the battery "forgets" that it has the capacity to further discharge all the way down. To illustrate: If you, on a regular basis, fully charge your battery and then use only 50% of its capacity before the next recharge, eventually the battery will become unaware of its extra 50% capacity which has remained unused. The battery will remain functional, but only at 50% of its original capacity. The way to avoid the dreaded "memory effect" is to fully cycle (fully charge and then fully discharge) the battery at least once every two to three weeks. Batteries can be discharged by unplugging the device's AC adapter and letting the device run on the battery until it ceases to function. This will ensure your battery remains healthy.

What is the cycle life of rechargeable battery?
When a battery experiences a charge and discharge, we call a cycle or a period. In the stated charge and discharge principles and the capacity decline before a stated standard, the total cycles it can undergo called rechargeable battery cycle life.
What is Li-ion polymer battery defined?

The so called Li-ion polymer battery is evolved from common liquid Li-ion battery by using licoo2 at cathode, carbon at anode, and polymer foil as electrolyte, eventually put these materials into a pouch shape aluminum plastic film package. Li-ion polymer battery is the new generation Lithium battery that has made significant milestones in battery's development. The obvious advantage of the Li-ion polymer battery not only has its high capacity, long cycle life, steady discharge rate and non-pollution, but also eliminates safety hazards that liquid Li-ion battery exists, especially of those steel can batteries. Furthermore, the flexible outline and custom design shape is more convenient at fingertips in a timely and cost effective way.