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For sale here we have the above parts…
Miniature PCB mounting battery employing Varta’s Ni-MH technology.
Contains 0% cadmium 0% lead 0% mercury.
Suitable drop in replacements for Ni-CD cells.
Used as back up power on PCB’s.
VARTA Micro battery has provided solutions to major OEM companies for high-tech applications in cordless phones, notebook bridging function, memory backup and real-time clock in PCs/notebooks as well as power sources for toys, remote control devices, torches, domestic alarms, car alarms, medical equipment and many more.
PLEASE NOTE! These batteries have been kept in storage for some time (we believe their date of manufacture to be 2008 or 9) but with care, can be fully charged and provide long service…
An old friend of ours tried some of these for us recently and provided the following….
“I charged the batteries on a current limited lab power supply with the maximum current set to 10mA to protect the cells from over current. I charged them in two sets connected in series (8 and 7 in series). I increased the voltage across the batteries until current was drawn by them and steadily increased the voltage until I got to around 22V. I then let the batteries charge for 10 minutes at 10mA before carefully reducing the voltage across the batteries until 3mA was drawn. After a few minutes this dropped to zero mA as the batteries charged. I increased the voltage to obtain a steady 1mA charge rate and let them trickle charge for 20 hours.. If my lab power supply had been able to current limit down to 1mA it would have easier but it’s minimum is 10mA. As a result I had to manually adjust the voltage to keep the current at the desired level. It was no great hardship though and was easily achieved. The thing to watch for with these cells and batteries is crystals forming at the cell seals, at the edges of the green shrink wrap or on the leads. Those cells are effectively scrap as the crystals have grown inside and ruptured the electrolyte seal.
I am installing the batteries in Early Toshiba laptops…namely the Toshiba Satellite Pro 4600 and Portege 7220. Most Toshiba laptops of that period (late 1990’s- early 2000’s) had these installed. The laptops of that era often used Ni-Mh button cells for the RTC / CMOS BIOS memory. These cells are now old and often leaking so have to be replaced. The Toshiba laptops use two cells in side by side configuration but I will find somewhere to fit the stack orientation that I have purchased from you. They are not a direct replacement fit though. The exact fit battery costs around £11 per battery ! The whole laptops only cost me around £15 to £25 each and I own six of them so I am improvising to solve the RTC battery failure. My Dell X300 slimline laptop from the same era also used Ni-Mh button cells for the RTC but three in side by side configuration as a stick. I will have to work on disassembling the battery pack into separate cells for that application but I have a good battery tab welder so no great problem.
Modern laptops and tablets do not use Ni-Mh rechargeable batteries for the RTC and BIOS as they fell out of favour due to premature failure and leaking. The common non-rechargeable CR series Lithium cells are used for that task now. They last many years and do not leak.”
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These Ni-MH cells have long life, no ‘memory effect’ and are environmentally friendlier than Ni-Cad equivalents.
Operating temperature: 0°C to +60°C
These parts came to us as part of a lot of surplus stock from a large distribution Co. and have been kept in storage for some time, we have therefore classified them as ‘new other’. They are however in good serviceable condition, stored with us still in their original packaging, a random sample has been tested and they held their charge well. Please see the above instructions for the best way to charge them. The photographs are representative of their good condition, and every effort will be made to dispatch batteries in good order i.e. no crystals forming at the cell seals, at the edges of the green shrink wrap or on the leads, and if we did miss one, as with all our products they come fully guaranteed.
If you have similar items to this, or indeed any electronic components that are surplus to requirements please contact us with details.