Lithium ion vs alkaline for AA battery pack

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iam2sam:
Hello. I wasn't sure where to put this question, so I guess I'll start here and let the mods move it if needed. I have two older detectors: a Fisher 1280-X VLF, and a Garrett Sea Hunter Mark II PI. Both are set up for packs of 8 AA batteries. I would like to switch to LI AA batteries, but I have seen posts on detecting forums (not necessarily this one) in the past advising against that practice, and implying that damage to the detector could result (without citing specifics). I emailed Kellyco tech support recently asking the question, and they also advised to stay with alkaline batteries over lithiums, again without giving a specific reason. Can anyone here tell me if there is an actual known problem created by powering metal detectors designed for 1.5V AA alkaline batteries with 1.5V AA LI batteries? Thanks.

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PSS:
Posable over voltage but with some machines it is OK. Most 12 volt machines are OK with them and have voltage regulated. But they can put out up to 1.7 volts. Regular recharbles are 1.2 volt and as you know alkaline are 1.5 volt.

I used to put these in everything until a accidently shipped them off in a DFX and the buyer refused to ship them back at my expense.

They basically run at full power until they completely shut down and go dead in need of recharge. Mine ran about 1.5 to 1.6 volts and were fine.

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But for instance If you have a Techpoint or F-pulse pinpointer best to not even bother with 1.5 volt and use 1.2 volt rechargeables. Some things are just made that way.

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iam2sam:
My lithiums are take-outs from a game/security camera system I have on some off-grid land that we visit only occasionally. We cycle the batteries annually because we don't want the cameras to switch off while we are away. They all test at 1.7 - 1.8V (cheap MM, so that may not be 100% accurate). Seems like those might be risky to use in my detectors. After posting my question, I found a couple threads on MD forums regarding alternative AA battery types. The consensus recommendation for not spending a fortune on alkalines for heavy use seemed to be to switch to NiMH rechargeables, so I went that way. I ordered enough Panasonic Eneloop AA batteries for each detector, a full (8 ea) spare set, and 2 more for my pin-pointer, plus 2 four-place chargers, so I seem to be set. Thanks for the reply, though!

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PSS:
The ones I used and linked have built in voltage regulators. They are advertised as constant 1.5 volt. I can attest to that. That is why I recommended them. I had used Eneloops in Excalibur AA pods but stopped using them because it did seem that in that machine it liked 1.5 volt batteries much better. 8, 9 years later I still have the Eneloops that I got on sale at Costco and they still work. In fact they are what are in my F-pulse and they calmed it down to a usable state.

Happy Hunting

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