ITTSB.EU Blog Forum
ITTSB Blog Specific => ITTSB - Small projects by Kiriakos & User reviews => Topic started by: Kiriakos GR on September 17, 2017, 08:43:42 PM
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I was aware that after ITTSB this having a new constant current load (battery capacity tester), this tools will help me to find out complete truth about any rechargeable battery that I own.
Sub C NiCd according to latest EU directives this is a forbidden type of battery to be sold in Europe, by an exception of tools using them (military use or healthcare).
About a year ago I was in need to refurbish NiCd power pack of screwdriver/ power drill, and I did purchase from eBay NiCd 2500mAh cells by the hope that I would get at least 1400 ~ 1600 mAh from them.
I am not making heavy use of my cordless power drill and therefore I was unable to evaluate actual batteries capacity.
In recent days I did feel that battery pack this cut-out earlier than the usual, and I did open it up for inspection.
One cell of eight, this formed higher internal resistance, and therefore this one started receiving and storing less charge.
six cells looking good so far, and seventh this just started having higher internal resistance.
I thought to perform capacity inspection in the ones with lower internal resistance as them be best regarding condition.
Prior performing any test to these cells, i did perform similar tests to unbranded batteries them be designed for cordless tools, them supposed to be 1600 mAH as new and now as used they deliver around 1400.
Testing of cells for power tools, at fast drain 1.6A they did deliver 1.200~1.400 mAh ( three used samples), fourth cell was heavily damaged (No good for any use) .
Today by testing cells at my power pack, I did not liked the truth at all.
Fake labels of 2500 mAh out-side and cells these be at about 1000 mAh its one, at low drain test 400mA and at high drain test at 1.4A they deliver less or about 700mAh.
Fake capacity this does not only translates that your run time will be less, Fake capacity also translates that your charger this deliver higher charging current than what these Ni-CD cell for toys, they are able to handle, and frequent use of your power tool this will create stress to the cells and them will collapse much sooner than what you would expect.
Lesson learned ... I am going to buy only genuine Ni-CD Panasonic stock from Germany, as I am thinking to rebuild this battery pack for a last time.
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At my latest battery rebuild I did wiser choices, here are my capacity tests of true Ni-CD for power tools. 8)
http://www.ittsb.eu/forum/index.php?topic=1384.0 (http://www.ittsb.eu/forum/index.php?topic=1384.0)