AlphaOp Posted July 6, 2002 Share Posted July 6, 2002 Hey there. I use a few brands of NiMH batteries (they're great!) for my Garmin GPS-III. However, the battery gague can only be based on three battery types: Alkaline Nickel-Cadnium Lithium What setting is the most accurate to gague remaining power when using NiMH batteries? I'm guessing Nickel-Candium, but I just was curious. CODENAME: ALPHA OPERATOR daedalus://govlink/secure/majestic/12.12.12/ops/throne/AO MAJESTIC-12: THRONE G6 LEVEL AGENT http://www.planetdeusex.com Quote Link to comment
+JAR Posted July 7, 2002 Share Posted July 7, 2002 You've probably made the correct choice. Most battery charge indicators measure the battery's voltage. NiCd and NiMH recharegeables both produce about 1.2V fully charged, while conventional "alkaline" batteries generate 1.5V. I'm a bit surprised at the "lithium" choice; I wonder what Garmin had in mind? Until recently, lithium primary (non-rechargeable) batteries produced about 3V; there are minor differences depending on the specific chemistry used. Both lithium / manganese dioxide (Li/MnO2) and lithium / poly carbon monofluoride (Li/(CF)x) batteries are sold for consumer use, also some lithium / thionyl chloride (Li/SOCl2) are occasionally seen. All of these are roughly twice the voltage of "conventional" batteries like carbon/zinc and alkaline, so they were sold to be used with a dummy battery that took the place of a second battery in series. I don't know if the GPS III could take these batteries; check the manual. There are 1.5V consumer lithium batteries now on the market, sold under the Energizer brand. The "alkaline" setting would be appropriate for these. Hope this helps. Quote Link to comment
+david&diana Posted July 10, 2002 Share Posted July 10, 2002 Last year, I asked Garmin about NiMH batteries in my GPS-III. Here's their reply. Thank you for contacting GARMIN. Yes, you can use NiMH batteries in your unit. However, even selecting NiCAD will not give an accurate reading of the power consumption of the batteries. You will have to change the batteries based on when you think they are getting low. Thank you and best regards, Garry Marshall Customer Service Representative GARMIN International 1-800-800-1020 913-397-0836 (fax) http://www.sales@garmin.com Quote Link to comment
momo-p Posted July 16, 2002 Share Posted July 16, 2002 NiCad setting gives very useful power reading for me using NiMh batteries. The meter is full when they are fully charged, gradually goes down to empty, and abt half an hour after I get low power warnings, the device goes blank and turns off, and the batteries are really flat. Fully charged they have abt. 5.1 V on the GPS voltage reading Quote Link to comment
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