This compaq presario cq20 charger is the highest quality product you can buy which has passed international certification( CE, UL, ROHS, ISO9001/9002 ). No memory effect, works great as a spare providing extra power when traveling or away from the home/office. Every piece compaq presario cq20 ac adapter power charger combination protection by the PCP board, PCM board, intellectual power measurement circuit : automatically adjusts the charging time to achieve the maximum amount of charge, over-charge protection, over-discharge protection, overcurrent protection, short circuit protection.
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While it is normal for an AC adapter to get warm to the touch while plugged in, any other signs of trouble may require immediate action. If your compaq ac adapter is making a high pitch noise, replace it. If your compaq presario cq20 adapter stops working completely, it may be a sign of a bad transformer or a wiring issue. If you fancy yourself an amateur repairman, keep in mind that it is generally a bad idea to open up the AC adapter for any reason. In addition to being notoriously difficult to open (without a hacksaw), the internal components can deliver dangerously high voltage levels to inexperienced repairmen.
If you find that your adapter is no longer working, there are a few options for replacing it. The first option is to order the same or a similar compatible compaq presario cq20 ac adapter. The second option is to order a universal one. But Best to use a dedicated AC adapter for charging the new compaq laptop battery.
Note: Universal power adapters come with multiple tips to fit the different types of laptops on the market. If in the future you choose to purchase a new laptop, a universal laptop ac power adapter may have a tip that will work with your new one. The advantage is that you would have a spare for future use or one to keep at home or in the office, which would make one less thing to carry.