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Why do some electronics say not to use rechargeable batteries?
The instructions for the alkaline pack say not to install rechargeable cells – because the pack would be unsafe with the higher-current cells and no fuse. Photographers often use electronic flash for lighting at night. Portable flash units use battery power to generate high voltage to recharge a capacitor.
Do batteries break in a short circuit?
Also referred to as a short-circuit, it usually happens when the separators in a battery melt because of an overheated cell. In most cases, the damage in the separator is initially caused by external factors, usually a defect in the cell package. But there are also other factors that can cause an internal short.
What should you not use rechargeable batteries for?
If to hot, rechargeable batteries can split, cause smoke/fire, and high heat will greatly diminish the charge capacity. If rechargeable batteries are to cold, the voltage will drop, may not function at all and again may cause the charge capacity to diminish…..not exactly what I’d want for a flashlight in my vehicle.
How does a protected lithium ion battery work?
Protected Lithium-Ion (Li-ion) batteries have a small electronic circuit integrated into the cell packaging. This circuit protects the battery against common dangers, such as overcharge, over discharge, short circuit/over current, and temperature.
What’s the difference between protected and unprotected batteries?
Unprotected batteries do not have this electronic circuit in the cell packaging. Because of this, they can have more capacity and current capability than a protected cell. However, there is always a danger of over heating, short circuiting, or over discharging.
How is a protection circuit attached to a battery?
For the first 3 items, a circuit board attached to the battery can monitor the battery voltage and the current going out. These are often referred to simply as protection circuits. They are very common on standard batteries but you must check the datasheet or product image to verify that a protection circuit is attached
When to disconnect a battery from the power supply?
As soon as the first battery is charged to 4.25V the pack is disconnected from the power supply. In this particular case, the total energy in the pack is pretty low because the batteries where significantly unbalanced. Why not disconnect only the most charged cell?