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How To Charge a Laptop Battery June 14, 2009

Posted by laptoppartsexpert in Battery.

I get asked all the time what is the best way to charge a laptop battery. There are many schools of thought on this but I will explain what the best battery manufacturers have told me.

First, when you receive a battery, it will not have a full charge. The reason for this is that the Lithium cells inside the battery pack are highly volitile and you do not want to transport the battery this way. When you install the battery, you can do two things. You can either charge it up overnight and then drain it down completely or you can drain it completely and then charge it up fully for 8-12 hours. I am not sure there is a difference between the two but most manufacturers say you should do this three times when you get your new battery.

Lithium batteries are only good for about 300-500 charges. In my experience though, they seem to last longest when you charge up the battery fully and drain it fully once a week. As mentioned earlier though, do not leave the battery fully charged if you plan to store it for a while. You may leave it in your laptop while plugged in but you should drain it at least once a week for maximum usability.

For additional information on battery safety when traveling on an airplane, go to the Department of Transportation website: http://safetravel.dot.gov/index_batteries.html

Jeremy Schwaeber


Laptop Memory Explained June 8, 2009

Posted by laptoppartsexpert in Memory.

For years, I have been asked if memory has to be used in pairs. This seems to be an urban myth now. Back in the early years of PCs, the memory used was call a SIMM, Single Inline Memory Module. When using SIMMs, they had to be used in pairs, usually matching pairs. And the chip type had to be the same in DRAM, you couldn’t mix the standard Fast Page mode with the newer technology called EDO, Enhanced Data Output.

When more advanced CPUs were introduced, new memory types came out with them. The least popular was RAMBUS which I have never seen offered in a laptop, only desktops. The type that was popularized was SDR or Synchronous Data Rate chips. These chips were built on a DIMM or Dual Inline Memory Module. Unlike the RAMBUS chips where every memory slot had to be filled, even with a dummy module, SDR DIMMS could be used one at a time and in mixed densities like 8MB and 16MB together.

As chip technology became more advanced, DDR DIMMS were introduced which ran at Double Data Rate. They can still be used one at a time and they are backward compatible to older speeds.  We are currently in DDR3 now which goes up to PC10600, DDR1333 speeds.

To find the memory that goes in your specific model of laptop go to our website at www.laptoppartsexpert.com.