Help please

[sws33]

Are there any Fisher CZ 21 users out there that can point me in the direction of some acceptable rechargeable 9 volt batteries?

 

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[Icewing]

There should be some local specialty battery stores that sell them, but it has been my experience that 9v batteries take quite a while to charge.

 

[sws33]

Charging time is not an issue with me, it's the voltage supplied by the battery itself. Store bought alkaline batteries are 9 + volt, rechargeable 9 volt batteries for whatever reason tend to be around 8 volt output. I've heard of some guys taking batteries that have reached 8 volt or a little less and replacing them, so I don't want to buy a batch of rechargeable batteries that fully charged are the same voltage as the ones other guys are throwing in the garbage. But throwing away batteries after only three or four hunts seems like a waste, but I don't want to keep using them if I am losing depth because of a lack of voltage.

 

[nomad 11]

every time i stick my neck out and help a friend i get my head chopped off. ? life is a compromise. how about this. you buy some alkaline batt's off ebay and use them alternately while your rechargeables are charging. but them we have the voltage depth issue ? ah what do i know ?

 

[sws33]

well I'm certainly not here to chop anybody's head off, and honestly I don't care if the batteries take 12 days to fully charge, I just want a rechargeable battery that will last more than a couple hours hunting. I just don't want to have to go through the trial-and-error phase of buying 12 different brands before I find the one that actually works. So far I have purchased the ebl 600 milliamp rechargeable 9 volt batteries and I don't think I got more than an hour and a half out of them before the detector started getting weird.

 

[Bill G]

Try these they worked well in the CZ-21. Batteryjunction.com. Tenergy rechargeable batteries.


All The Best,
Bill G

 

[cladpirate]

Why not switch to lipo? Should be lighter but you would need to be sure to not discharge them too much. Just today I saw a 3d printable insert for the cz to house a lipo, I'll try to see if I can relocate it.

 

[WaterWalker]

Here is the reason why the differences in voltage. From:
https://michaelbluejay.com/batteries/9v.html

1. "9V" is the physical size/shape, not the actual voltage. An alkaline 9V is really 9 volts, but a rechargeable "9V" battery is initially 9.6V, 8.4V, 7.4V, or 7.2V, depending on the model in question. In the rest of this discussion, "9V" refers to the 9V size, not the actual voltage.
2. Performance of various voltage 9V's.
   1. 9.6V (NiMH). It's rare, but will always provide good runtime and performance. Achieved by using eight 1.2V cells.
   2. 8.4V (NiMH). These will often be good too, but some power-hungry devices might do worse with 8.4V than with 9.6V. Achieved by using seven 1.2V cells.
   3. 7.4V (Lithium). Usually work well even with the lower voltage because lithiums have such a high capacity. Achieved by using two 3.7V cells.
   4. 7.2 (Lithum). Same as above, using two 3.6V cells. Li-Ion cells are generally 3.6V or 3.7V.
   5. 7.2V (NiMH). I'm skeptical would ever provide good performance, but I haven't tested them so I can't say for sure.

I would take a look at the Maha Powerex (MHR9VP) for the Maha Powerex (MHR84VP).
9 and 8.4VDC respectively.

 

[dewcon4414]

IF the machine has a control voltage......then it is more about storage/recharging time....so Lith is hard to beat with a smartcharger. But with any machine that you have to replace or remove the battery for charging..... i think its important to open that box after every hunt just to check for water.

 

[ivanll]

Alternatively a 6 cell battery holder with 5 Li-ion cells and a dummy screw will do the job of powering the CZ 20/21.



ivanll