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Posted By Dave B
A bit of advice needed please. What is the correct method of carrying out a 'high discharge' test on a vehicle battery whilst avoiding the risk of a spark igniting gas given off by the battery. I am led to believe (rightly or wrongly) that it is common practice when trying to identify dud battery cells to carry out the test with the cell caps removed and after suitable venting. This strikes me as extremely dangerous. Can anyone enlighten me on the safe procedure which will eliminate the risk of a battery explosion.
Many thanks
Dave B
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Posted By Alan Nicholls
Dave
You don't need to carry on that type of test.
An intelligent battery tester can be purchased 12volt lead acid's 1.2Ah up to 200Ah. Try a google.
Regards Alan N
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Posted By John Lawlor
Dave
I seen a guy doing that test and believe me he is lucky to be alive, the battery blew up in his face and acid went every where.
there are testers available at very small money, you should be able to pick them up in your local auto factor shop
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Posted By Dave B
Thanks for your responses,guys.
It struck me as a very dodgy operation.
Dave B
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Posted By Renny Thomson
Also ask:
Why do you need to know which cell is duff?
After all, its not as if you can change one cell. The battery will need replaced....
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Posted By Dave B
I am still being told that although a battery tester will indicate that a battery is OK, it is only under high loading (similar to that when starting the engine) that a possible battery fault can be discounted.
Aren't there safer methods of putting a battery under load (and is it necessary)?
Thanks for your inputs
Dave B
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Posted By Robert.
The health state of a (lead-acid) battery can be checked by checking the voltage of each cell.
Can't remember what the healthy voltage state is but a lower voltage will indicate deterioration of a cell indicating a cell change if it is an automotive battery or replacement of new battery.
A hydrometer will also indicate the condition of the electrolyte.
Discharging (banks of) batteries is an exact science and requires constant monitoring.
The old method was to use a high rate discharge tester, but this produced sparks.
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Posted By Anthony Slinger Hi Dave B, I use a tool like this one. (other testers from different suppliers are available!) http://www.justoffbase.c...T91-7?sc=9&category=2273More info here http://www.sealey-tools..../instructions/BT91-7.PDFA battery charger will not tell you if a cell is faulty, this tool will. It also measures the voltage during starting and charging. It can be connected to the terminals without causing a spark. The test begins when the switch is activated. Follow the general precautions include allowing the battery to vent after charging. I have tested loads of batteries (up to 300Ah) with this equipment with no problem. You can get another type with two prongs and handles on top. http://www.justoffbase.c...T91-3?sc=9&category=2273These are not so good as there is a chance of creating a spark when you make contact with the terminals and you also have your face directly over the battery when testing. Anthony
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Posted By Dave B
Thanks, guys. Just the info I needed.
Dave B
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