I've now had a second battery replacement, and have therefore come to the
conclusion that it may not be a fault with the battery. The last time it
drained to nothing in 2 days (and it was absolutely nothing, not even enough to
light an LED!). I immediately detached the terminals and found there was no
resistance - indicating nothing in circuit?
Although I'm confident with simple circuits, I'm the first to admit that
electronics is beyond my brain power................. I set about some
detective work today
Findings 1. With meter set on ohms, I get no reading across the battery
terminals when disconnected from the battery and nothing in circuit.
2. With the battery terminals connected and the engine running the voltage
across the terminals is 13.7V
3. Without the engine running the voltage across the battery is 12.6V
4. With the battery terminals disconnected and the meter set to 2V, I
found there was a voltage of 0.048V when the meter was connected, which reduced
to level out at 0.015V. It didn't seem to matter when the meter was connected
ie If I measured across the terminals 3 Sec after disconnecting from the
battery it was the same as if I waited 2 minutes, and also the drop once the
meter was put across was delayed if interrupted eg . 0.048 then watch it drop
to 0.030, remove meter for 5 seconds, reconnect meter and the reading was
0.030, then dropped further.
5. Having removed all the fuses, the same occurs.
The alarm fuses have been disconnected as well, but I don't think it has a
battery in it.
6. Connecting the meter between the engine block and the positive battery
terminal measures a lower voltage 0.028V, which drops to the same 0.015V
Is it maybe electrolytic reaction within the block? As I say I'm not into
electronics.
Why is there no measured resistance, but the battery drains?
Any ideas gratefully received.
Martin
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