High Current Battery Charger. Design Trick 10


Lead Acid and Tubular battery sometimes require boost charging with high current to remove the memory effect. In Inverter battery, the charger delivers low current since the charger is always on to charge the battery. If the line voltage is low, the charging will not be complete and battery gets only partial charge. This leads to memory effect and the battery remembers this partial charge as full charge in the subsequent charging. The best method to remove the memory effect is boost charging with high current for a short period. It is better to boost charge the inverter battery once in a month using an external charger after removing the battery connection from the inverter. This charger will do a quick charging and is ideal for Automobile battery and Inverter battery.
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Why Laptop battery reduces its efficiency? Tech Focus 9


Laptop battery is a kind of Lithium Ion ( Li-ion) battery which has features like high efficiency, slow discharge rate, best energy to weight ratio etc.Unlike other rechargeable batteries, Lithium ion battery uses Lithium as the active material. During discharge, the lithium ions move from the negative electrode to the positive electrode. The flow of lithium ions reverse during charging. Lithium Ion battery outperforms other types with its features like High open circuit voltage that deliver high power at low current rate, Low self discharge rate of 5-10% per month etc. But along with these advantages, lithium ion battery has demerits also. Memory effect, self discharge, over heating etc are the most important drawbacks of Laptop battery. Let us see how this happens and the solutions to prevent this.
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Why Emergency Lamp is not doing well? Fact File 18


It is not its fault! But ours. We search for the emergency lamp only when power fails frequently. Otherwise it will be a dust depositor somewhere. To make the emergency lamp in good condition, proper care is needed. The emergency lamp battery is SMF (Sealed Maintenance Free) type and need not require water topping and can be placed in any position. It is rated 6 volts @ 4.5 Ah backup current.

 

The electrolyte of most SMF battery is a gel of Sulphuric acid mixed with Silica fume which makes the resulting mass gel like and immobile. This gel electrolyte reduces the electrolyte evaporation, spillage etc. One important feature of Gel battery is that the lead plates contain Calcium instead of Antimony to reduce water loss. Because of the presence of calcium, the gel battery charges very slowly compared to other batteries. Another important feature is its thermal sensitivity so the battery is vulnerable to thermal run away due to abusive charging. Over charging leads to its premature failure.

The Emergency lamp battery requires equal charge and discharge cycle. That is, it should be charged and discharged daily or once in two days. If it is always plugged in for charging, overcharging occurs leading to its permanent damage. If the battery is kept without charging for few days, self discharge takes place and the battery develops Memory Effect so that it will not charge fully. Deep discharge is another problem that can affect battery life. When the emergency lamp is kept switched on till it completely shut down, two adverse effects happen. The battery will not charge fully in recharging and the ends of tubes turn black due to filament damage. So it is better to switch off the lamp, when its light intensity drops.
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Trick to Save Battery


Save your spare batteries from self discharge due to improper charge- discharge cycles. If you forget to charge the sealed lead acid battery for long period, it will not accept full charge during charging and its performance deteriorates. A solar panel can solve the problem and since it charges only during day time, over charging can be prevented .
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