Laptop Battery Power supply. Start Up Project 38


12ADon’t throw away old Laptop battery; it can be reused for other purposes. I hacked one Laptop battery and salvaged six high efficient Samsung Lithium Ion batteries each rated 3.6V, 4300 mAh. It is worth Rs. 1000. Few days before, I found that, my Laptop is not getting enough back up and shutdown immediately when the charger is removed. So I replaced the battery at the cost of Rs.1200. Due to curiosity, I just opened the case of the old battery pack and found that, the batteries inside can be reused. After testing, I found that only one battery out of the six is damaged. All the other five are in good condition. That damaged battery created the problem in the battery pack and prevented the remaining five batteries from their work. So actually this is happening in our Laptop. If one battery fails, we have to replace the battery pack. If the good batteries are salvaged from the old pack, we can reuse them for many different applications like LED lighting, Mobile charging, making power supply etc. So I spend Rs.1200 for the new battery pack but I salvaged 5 good batteries worth Rs. 1000 from the old battery pack. So my actual expense is only Rs.200. So do not discard the old Laptop battery. Tear it, salvage the individual batteries and reuse. You can save money and can reduce the e-waste.
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Servicing a Maintenance Free Battery. Start Up Project 29


6BI found that my UPS is not giving sufficient back up as expected for 20 minutes. I thought that I have to spend Rs. 800 to replace the battery. But I was not in a hurry. Want to find out the reason. After 5 minutes, the PC shutdowns. Why so? The UPS battery is not giving sufficient power (Ampere Hour) to run the load. The UPS battery is a 12 volt 7 Ah (Ampere hour) Maintenance free Sealed LeadAcid battery (SLA). That means, it is “Maintenance free” and can be used for long time without any attention. But what happens is, the cells dry out due to heat generation. This happens after 6 months to 1 year of use . It is a Lead Acid battery that requires Electrolyte in the cells. So water is necessary inside. It has 6 individual cells giving 2V each. After removing the battery from the UPS, I found that it is very easy to rejuvenate the battery through “Hydration”. The battery will become top, if the dry cells are filled with battery water. Hydrated the battery and charged. Well, now it is giving more than 15 minutes back up. Saved Rs. 800 and reduced an e-waste. You can also rejuvenate the 6V Emergency lamp battery like this. So do it yourself. It is only a 10 minutes job.

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Solar Power Outlet. Start Up Project 4


17AWhy wasting electricity for charging USB devices including Mobile phone? Sun is there to give power for this. Install a Solar Power Outlet in your home to harvest solar power for charging all USB devices in day time. Its cost is only Rs.500 and you get unlimited day power for more than 25 years to charge all USB devices. The expensive part of the project is Solar Panel. A 12 Volt 5 watts Solar panel costs around Rs.400 because the current rate is around Rs.80 per watt. The remaining components costs only Rs.100. So by spending Rs.500 initially, you can charge all your USB devices at the expense of only 6 Paisa per day . The calculation is for 25 years (50,000 Paisa / 9000 days = 5.5 Paisa). So hurry up to make this project.
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PIR Sensor Module. Component Guide 2


PIR-2 PIR Sensor Module is one of the new introductions in electronics which is a highly useful device to switch on lights when it detects a human movement. It turns on the lights from 30 seconds to 3 minutes depending on the preset adjustments. Its range can be as high as ten meters which can also be adjusted. The module gives a high output when it detects the human movement. This high output can be used to drive a relay through a switching transistor. Let us see the details of PIR sensor module.
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Conserve Power – More Star More energy efficient


Energy Sticker
Energy Star sticker is seen in current hungry appliances like Fridge and Air conditioner. This indicates the energy efficiency of the appliances. Energy star denotes the international standard of energy efficient products implemented in 1992 by the Environmental Protection Agency and the Department of Energy .It was started in United States of America. The Devices carrying the Energy Star service label generally use 20–30% less energy than required by federal standards. So by comparing the stars, the consumer can choose the model .
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