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Explorer NiMH Battery Pack Voltage for Exp II

A

Anonymous

Guest
Just curious what kind of voltage people are getting off their Explorer NiMH Rechargeable battery pack after a full 16 hour charge. I'm only getting 9.59v per my digital voltmeter. Is there a low end voltage that might cause loss of depth, accurate ID, etc. It seems like when I first got it in Feb 2004 I was getting 10.4 v or better.
 
Mike,
I am able to charge my battery to 11.4V. You might try leaving it on the charger a bit longer and see where the voltage goes.
The flat part of the discharge curve is about 10.5V to 10.25V. The difference between 10.4V and 11.4V is about 5 hours of useage time.
HH, Glenn
 
NiMh batts will get around 1.35 to 1.40 Volts per cell fully charged. This will quickly drop to 1.2V per cell and stay there until the pack is nearly discharged, when the volts per cell will drop rapidly.
So, 1.35 times 8 is, um, 10.8, and if 1.4, it's 11.2.
If you're only seeing 9.59, you probably have something wrong with your battery or charger. I'd almost be willing to bet you've lost a cell. They sometimes just short out when they go bad. 10.8 minus 1.2 is 9.6V. Eerily close to the voltage you're seeing...
Where does your battery indicator show when you put in a new pack? What does the V read after you've run the pack for 4 hours? The V after 4 hours should be incredibly close to 1.2 times 8 (9.6V) since NiMh batteries have a very flat discharge curve.
Hope this helps a little...
Rhoderman
 
Used mine for about 1.5 hours in the yard tonite and its still at 10.49 volts. I had a full charge when I went out. You more than likely have a dead cell!
HH Gilly in Illinois
 
I'll have to check the 4 hour voltage drop, but when I 1st put the pack in if memory serves, the icon shows full. Thanks for all the info everyone. If its a dead cell I guess I'll be calling Minelab to see if they can help me out with a new pack.
 
Mike,
The information that I provided above comes from the battery discharge curve shown on page 92 of the Explorer II manual. My experience has been that this curve is quite accurate when the battery is new. I generally start with a full charge and keep track of the hours of usage. By measuring the battery voltage after the hunt I can tell when the battery performance begins to degrade.
Note that on page 25 of the Explorer II manual it states that the battery can be left on the charger indefinitely without harming the battery.
HH,
Glenn
 
I checked my battery on 3 meters, all 3 were not the same, my best meter had a reading was 10.79, and that is with a full charge and has been off the charger for 48 hrs.Hope this helps. HH..BJ
 
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