Andy/Memphis
New member
i know they run on 8 double A batteries can you run them on two 9 volt batteries instead
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1260x to 1266x series batteries
- Thread starter Andy/Memphis
- Start date
Andy/Memphis
New member
talked to fisher yesterday and they said it would work for awhile but would eventually burn out thanks for the replys
MarkCZ
Well-known member
Hemm, now wait minute????
Dry cell batteries are rated 1.5v each.
The battery packs has four In series,
so the rated voltage for one pack would be 4 X 1.5 volts = 6 volts (well it was when I went to school LOL)
Now what I don't know is are the two battery packs wired in series or parallel??
If the two 6 volt packs are in parallel then the total voltage would be 6 volts (rated)
If the two 6 volt packs are in series then the total voltage would be 12 volts (rated)
Seeing how both the above are max out ratings means that in either case the detector would have to be running at a lower voltage than either of them.
The reason for that it the batteries need to have a ceiling (voltage above what the unit is consuming) and the electronic regulate it down to the lower voltage. That's the only way you get any run time out of the batteries.
So if the detector has a 6 volt battery pack then the detector is probably running on either 5 volts or maybe 4 volts. The 12 volts is probably running on something like 10 Volts or 9 Volts.
I have a couple of detectors that run on two 9 volt batteries, when the batteries get to 6 volt the detector battery indicator will show Low Battery, at 5 volts it will alarm. So the the detector is running on the voltage in the battery above the 6 volt line. You can put ONE full charged 9 volt battery in the detector and it will run just fine, just not for long (two 9 volts in parallel)
I take it that the Fisher 555-D must have ran on 6 AA's (the 1200's don't)
They run on two packs of 4 AA's.
6 AA's are 9 volts,
4 AA's are 6 volts!
That means that the detector is either running on,
6 volts, or
12 volts,
with its OEM battery packs.
Now if you were to replace those with two 9 volts batteries you would have either,
9 volts, or,
18 volts
This is why Fisher told the title poster that it would run on them but it may damage the unit doing it.
Mark.
Dry cell batteries are rated 1.5v each.
The battery packs has four In series,
so the rated voltage for one pack would be 4 X 1.5 volts = 6 volts (well it was when I went to school LOL)
Now what I don't know is are the two battery packs wired in series or parallel??
If the two 6 volt packs are in parallel then the total voltage would be 6 volts (rated)
If the two 6 volt packs are in series then the total voltage would be 12 volts (rated)
Seeing how both the above are max out ratings means that in either case the detector would have to be running at a lower voltage than either of them.
The reason for that it the batteries need to have a ceiling (voltage above what the unit is consuming) and the electronic regulate it down to the lower voltage. That's the only way you get any run time out of the batteries.
So if the detector has a 6 volt battery pack then the detector is probably running on either 5 volts or maybe 4 volts. The 12 volts is probably running on something like 10 Volts or 9 Volts.
I have a couple of detectors that run on two 9 volt batteries, when the batteries get to 6 volt the detector battery indicator will show Low Battery, at 5 volts it will alarm. So the the detector is running on the voltage in the battery above the 6 volt line. You can put ONE full charged 9 volt battery in the detector and it will run just fine, just not for long (two 9 volts in parallel)
I take it that the Fisher 555-D must have ran on 6 AA's (the 1200's don't)
They run on two packs of 4 AA's.
6 AA's are 9 volts,
4 AA's are 6 volts!
That means that the detector is either running on,
6 volts, or
12 volts,
with its OEM battery packs.
Now if you were to replace those with two 9 volts batteries you would have either,
9 volts, or,
18 volts
This is why Fisher told the title poster that it would run on them but it may damage the unit doing it.
Mark.
Mark I have and still use my 555-D \, It has 2 sets of 6 AA batts (9Volts) 1 was for the T-R side of the detector (Trans -Reciever) with a 2 position Batt test, the Audio set would go dead before the T-R side so the y are separate batt. function. I used to replace the ^-pack with 9-V trans. batt, worked great.
The legacy Fisher 8xAA battery systems are all series wired (nominal 12 volts) regulated down to 8 volts. The audio runs off the unregulated supply (i.e., direct off the batteries). The regulator is pretty sturdy and should handle the overvoltage from two 9 volt batteries in series. However the audio circuit may go up in smoke, perhaps in a few milliseconds and perhaps in 10 years, it's one of those things that's not really predictable. Headphones are a lot easier on metal detector audio circuits than speakers, so if you use headphones you'll probably be fine.
The electrolytic caps are still a risk factor: I think they were rated at 25 volts. If they were rated at 16 volts, new 16 volt caps will almost always handle 18 volts , but wet electrolytics that are more than a few years old will often fail under conditions that they'd have handled gracefully when new. If the electrolytics go up in smoke (or die smokelessly leading to unstable operation esp. on marginal batteries) they probably won't take anything else out with them and it will likely be a repair that just about any good electronic repair tech can handle.
Summarizing: speaker = moderate risk, headphones = fairly low risk.
--Dave J.
The electrolytic caps are still a risk factor: I think they were rated at 25 volts. If they were rated at 16 volts, new 16 volt caps will almost always handle 18 volts , but wet electrolytics that are more than a few years old will often fail under conditions that they'd have handled gracefully when new. If the electrolytics go up in smoke (or die smokelessly leading to unstable operation esp. on marginal batteries) they probably won't take anything else out with them and it will likely be a repair that just about any good electronic repair tech can handle.
Summarizing: speaker = moderate risk, headphones = fairly low risk.
--Dave J.
There's more to consider than the voltage.. You need to consider the current capacity of the batttery. Generally 9 volts batteries have less than 1000 mah of charge. most AA range from 2000-3000mah. They have more current available and will last longer than the 9 volt batteries.. hope this helps..
I used a 1260 X for several years.It carried two battery packs,one ran the detector circuits and the other carried the audio.If you were out hunting and the audio started going down,you could swap the battery packs around and keep hunting.These machines are silver magnets.You could hunt with your coil next to a chain link fence and still find silver.I wouldn't run nine volt batteries in your detector,It wasn't designed to carry the load and will burn it up.