Rechargeable or Non-rechargeable cmos rtc battery

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At times it becomes necessary to replace your cmos bios battery with an equivalent type of battery that will first of all retain the object of it's integration, which is to retain the date clock settings on the notebook, whereby only a new battery would accomplish that task. Then the other attribute of one's decision would be cost to acquire or finding such type of battery either on the web or thru a seller on ebay. While most notebooks are designed hence equiped with non rechargeable coin cell batteries, others accomplished the task of maintaining the firmware of the bios with rechargeable nickel metal hydride (NI-MH), Nickel Cadium (Ni-CAD), Lithium Ion (Li-ON), Vanadium Pentoxide Lithium (VL) , as well as Polymers, LIPO, Managesium, Silicon and other Hybrid composites where select chemistries are placed on the anode and cathode of these batteries. With the non rechargeable cells, the variance of brand can dicate the model nomenclature or designation type ei: CR2032  would both indicate that the diameter  20mm and thickness  (3.2mm)  conform to IEC 60086-3 standard codings for a  Lithium Mangasese 2032. Other  designations are BR2032, DL2032, ECR2032, E-CR2032, GPCR2032, KL2032, KCR2032, KECR2032, L14, L2032, SB-T15, all of which provide a 3 volt source potential. These would be used on Notebooks where the mating connector on the motherboard does not introduce a voltage to the battery in an effort to recharge it while the notebook is in operation.

Now with Notebooks that are equiped with rechargeable cells such as Dells, Apple and other brands, the intent is to design around a battery that can be charged and discharged in excess of 1000 cycles. The need exists to have these Notebooks charge the bios battery while in operation to peak peformance so that when the Notebook is turned off, these cells will retain those date/clock settings. While these rechargeable cell batteries are much less powerful, providing much less current, their ability to be recharged makes them a suitable choice over non-rechargeable cells. As of late, designers are making use of capacitors to achieve the equivalence of coin cell batteries in that they retain a charge for a lapse of time when the Notebook will have one of the two power sources (ac adapter or main battery power). How to determine what your notebook would need could be based on what it currently has, or to measure the pinout of the battery mating connector with a volt meter while the notebook is turned on.

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