The battery will be short circuited if the negative and positive poles are connected by some conducting materials, such as key chain and clip. It will be quite serious, for example, it will cause raise of battery temperature and internal pressure, then cause leakage.
To avoid short circuit, do not put charged battery together with the one with no package, coins or key chains in one pocket.
Yes, it will. "Over-charge" is described as a continuous charge action after the battery has been fully charged by a certain charge method. Since the capacity level from positive polarity is higher than the negative polarity, the positive polarity will generate Oxygen, which can be composed with the Cadmium generated from negative polarity via separator. In general condition, the internal pressure will not increase significantly, however, if the charging-current applied for battery is too much, the charging-time is extremely long and finally the Oxygen could not be used up in time, the battery will be defected by a pressure risen, battery distortion, leakage and so on. Definitely the battery's performance will decline as well
Yes, it will. If a cell's voltage reaches a designed value, that means the battery has discharge the stored capacity, but still the discharge action is continual, over-discharge will cause. Commonly the end voltage can be identified through discharge current, for example the end voltage is set at 1.0V/cell as discharged at 0.2C-2C, and 0.8V/cell at 3C or more, e.g. 5C or 10C. Over discharge may cause disaster, especially at heavy current or repeated over discharge. Commonly over discharge can make cell inner pressure raise, and the reversibility of activity materials both in positive and negative will be damaged. Even by charge only part can recover and the capacity is reduced obviously.
Yes, it will. Any kinds of conductive material being bridged with the external terminals of a battery will result in short circuit. Based on the battery system, a short circuit may have serious consequences, e.g. rising electrolyte temperature or building up internal gas pressure. If the internal gas pressure value exceeds the limitation of cell cap endurance, the electrolyte will leak, which will damage battery greatly. If safe vent fails to respond, even explosion will occur. Therefore don't short circuit.
The capacitance for Lithium ion battery is high and it is very light. The nominal voltage is 3.7V.
NiMH battery with high capacity(over twice higher than NiCD) can be charged quickly, it has very good performance, especially when using for high power consumption applications, such as digital cameras, electric toys and so on. The battery can be also used for CD,MD,MP3, the nominal voltage is 1.2V.
Working time for NiCD is shorter than NiMH, but it has long cycle life of over 1000times. It is the most cost-effective rechargeable battery. It is very durable and can work under low temperature. NiCD battery should be fully charged at first use which is same as other rechargeable batteries. The nominal voltage is 1.2V.
Put the battery in cool, dry, good ventilation place, avoid direct sunshine. For long time storage, the environment temperature should be below 30 centidegree. Do not use the battery or charge it under extremely high or low temperature.
Charge battery with correct charger, try to avoid over-charge, use the charger with good monitoring device and best to buy charger and battery kit.
If the electrical equipment won’t be used for a long time, it is better to take out the battery or switch off it.
The battery manufacturer should list all charging time it needs to avoid over-charge.
Do not mix batteries with different chemistry, capacity and charge level.