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Batteries for Eric's units

A

Anonymous

Guest
I, and probably others, would like to find out about batteries for the Beachscan and Goldquest units. I know that NiCad are not to be used. I believe this is becouse of the high current drain of the machines. However, I would like to know whether or not I can use NIMH batteries.
 
Hi Dale,
The recommended batteries are AA alkaline. These give good operating life and do not leak. Standard zinc carbon batteries can be used OK but will not last as long and if left in, in a run down condition, can leak and corrode the battery holder contacts.
NiCad or NiMH batteries can be used but the voltage is a bit less; 9.6V nominal, instead of 12V. This will result in a bit less transmitter current, but it practice you will hardly notice the difference. The battery warning beep comes on at 8.5V
The Goldquest/Beachscan detectors do not have a high current drain. 70 - 80 mA is all they take.
Eric.
 
I'm sure the AA NiMH batteries run at 1.5v, thus giving the required 12v (8x1.5v=12v), if my maths is correct?
Yes, the Nicads are 1.2v each.
Tony
 
Eric can I use my nicad charger for NiMH batterys?
Regards
kris
 
Hi Tony,
NiMH batteries are nominally 1.2V per cell, the same as NiCads.
Eric.
 
Hi Kris,
Provided it is a standard charger i.e.C/10, you can use it for NiMH batteries. However, you might have to leave it on for longer as NiMH have a higher Ah rating.
Eric.
 
I will get the address and post it for these new Nimh batteries...again 1.5 volts not 1.2....Frank
I believe it is Hughes co. or like that...I will get it...
 
http://www.thomasdistributing.com/9v-nimh-batteries-chargers.htm
look around at this site and they are there...Frank
 
Hi Frank,
I have been using NiMh's for over a year now in my modified Beachscan and they work just fine.
The voltage of each battery is just a little over 1.2V, more like 1.24V or so during normal operation. The voltage is basically the same on my earlier 1400 ma and now, my 1800 ma AA's.
They will charge to about 1.5V and stay there very briefly when removed from the charger and not under load, but the voltage will quickly drop down to 1.24V which is the normal operating voltage.
Reg
 
I can't see any mention of 1.5V. Jetcell have 1.2V printed on the battery case and in the FAQ on one site it gives the discharge curves, where the voltage starts off at 1.4 and then drops quickly to 1.25, then reaching 1.2V at 80% capacity used. This is at 0.2C discharge. In the Goldquest you would be discharging at 0.05C which may raise the voltage a bit.
Running the Goldquest at 10V rather than 12V is not going to change things noticeably and at the prices quoted, these batteries are a good deal.
Eric.
 
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