Charger

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  #1  
Old 03-17-10, 05:29 AM
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Charger

Hello,

I have a small Bosch IXO screwdriver. I tried to charge it a few times and it seemed battery was remain empty.

I checked the charger, mainly the output voltage on the pins, and it showed 11.5v. On the back of the charger it says the output should be 7.5v. Clearly a big difference.

Hence my questions ...
1. Is it really that the charger outputs too much volts? I was thinking that maybe the reading is biased because I didn't have the IXO screwdriver connected.

2. If it is too high, what are the chances the lithium batter is dead already?

Thanks,
Ronen
 
  #2  
Old 03-17-10, 05:56 AM
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You may have a bad battery, but you are seeing the open-circuit, no-load voltage. With a normal battery connected, it should drop to its nominal voltage.
 
  #3  
Old 03-17-10, 09:55 AM
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Lithium battery chargers also have some smarts in them to charge the battery safely. Measuring the voltage doesn't take into account the feedback system the charger has.
 
  #4  
Old 03-17-10, 07:01 PM
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The charger itself looks fairly plain. Nothing but a transformer and a bridge.

It seems like the "smarts" is in the screwdriver itself (opened it up yesterday and there was definitely more than just a battery and a motor there).

I noticed that when I place the screwdriver on the charger the charging led lights up very faintly and then diminish. Any idea how I can find what the problem is?
 
 

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