How can I get the third battery which must leaked, from my BDL 250S?
pry it out, any way you can without damaging the tool. Damage the battery, not the tool if you have to. Spray it down with vinegar first, that might help loosen it up. When you have it out, clean up the area with vinegar on a cotton swab first, then clean the contacts with a fine sandpaper or emery board. Careful with the vinegar, don't let it go where you don't want it.
What does fo3 mean on my vector battery charger?
Vector is a "Smart" charger. And won't charge a completely "dead" battery when old "not-smart" chargers would. How old is the battery?
You could take the battery somewhere and have it checked as to whether it's "good" or not before you blame the charger.
I have a Vector HID
Just a guess here. Sounds like the battery might have been left uncharged for a while and could need to be replaced. Lead acid batteries need to be kept fully charged as much as possible to prevent them failing (the chemistry begins to change quite quickly and irreversibly if the voltage gets too low, and they will then not recharge).
Top-up charge every couple of months if not being used to prevent self discharge from causing this. Always recharge promptly after use.
If you have a voltmeter, check the battery voltage, should be above about 12.4 v to prevent deterioration. Voltage should only drop slightly when light is switched on if the battery is good. Charger might be self protecting if battery is faulty.
These batteries are reasonably priced and very common, be careful to connect the right way round if you are replacing or you can destroy the electronics!
You might be able to connect a new battery (observe polarity!) to test it works before you buy. Check that the batt voltage rises slightly when the charger is connected to make sure the problem is not caused by a charging fault.
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