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24-07-2003, 11:21pm
Just to following on from Peter's info in mopre detail.
This information that follows is published literature from Bosch .
"The rated capacity of a battery indicates the amount of stored energy in the battery. It is determined by the amount of active material and electrolyte. The rated capacity is the product of current and time. Rated capacity is determined on the basis of the amount of current which can be supplied by a 12Volt battery at +27'C over a period of 20hrs without the terminal voltage dropping below 10.5Volts. ie a 200Ah battery can deliver 10Amps for at least 20hrs (10A x 20hr =200Ahr ) until the cutoff voltage of 10.5Volts is reached."
Now the CCA issue--
" The test current for low temperatures is an indicator of starting capability, it refers to brief current demand at low temperatures. The test current for low temperatures depends on........... battery material and construction. This is the current that can be drawn from a starter battery at -18'C without the terminal voltage dropping below 9volts within 30seconds and 6volts within 150seconds"
Bosch then go on to mention that different countries have there own standards so comparing one manufacturer with another from another country isnt always possible. Bosch specify to the DIN standard.
Hope this helps a bit with the sharing of knowledge.
Imagunna--- maybe now armed with this info you can ask both CBE and Yuasa how are there batteries rated. Bottom line is it wont tell you how long they'll last for though. I wonder if the Japanese Yuasa is actually made in Japan or China, Malaysia, Taiwan etc....... would this aspect influence our decision making????? in purchasing the product???
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This information that follows is published literature from Bosch .
"The rated capacity of a battery indicates the amount of stored energy in the battery. It is determined by the amount of active material and electrolyte. The rated capacity is the product of current and time. Rated capacity is determined on the basis of the amount of current which can be supplied by a 12Volt battery at +27'C over a period of 20hrs without the terminal voltage dropping below 10.5Volts. ie a 200Ah battery can deliver 10Amps for at least 20hrs (10A x 20hr =200Ahr ) until the cutoff voltage of 10.5Volts is reached."
Now the CCA issue--
" The test current for low temperatures is an indicator of starting capability, it refers to brief current demand at low temperatures. The test current for low temperatures depends on........... battery material and construction. This is the current that can be drawn from a starter battery at -18'C without the terminal voltage dropping below 9volts within 30seconds and 6volts within 150seconds"
Bosch then go on to mention that different countries have there own standards so comparing one manufacturer with another from another country isnt always possible. Bosch specify to the DIN standard.
Hope this helps a bit with the sharing of knowledge.
Imagunna--- maybe now armed with this info you can ask both CBE and Yuasa how are there batteries rated. Bottom line is it wont tell you how long they'll last for though. I wonder if the Japanese Yuasa is actually made in Japan or China, Malaysia, Taiwan etc....... would this aspect influence our decision making????? in purchasing the product???
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