[RCSE] Stoopid battery question #764
I'm making up a flight pack of 4 new NiMH 2/3 AAA cells. The polarity is not marked on the cells, but there's an indent at one end. Is that the positive? Joe Parsons RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
Re: [RCSE] Stoopid battery question #764
On Fri, Apr 23, 2004 at 02:33:26PM -0700, Joe Parsons wrote: | I'm making up a flight pack of 4 new NiMH 2/3 AAA cells. | | The polarity is not marked on the cells, but there's an indent at one end. Usually there's a `button' of sorts at the positive end, even for cells advertised as not having a button. But I guess there doesn't have to be ... | Is that the positive? Sounds like it. But why guess? Go down to Harbor Freight Tools (if you're in California as your domain suggests, they're all over) and buy yourself one of their cheap digital multimeters. Look for something like this -- http://www.harborfreight.com/cpi/ctaf/Category.taf?categoryid=170pricetype=Scategoryname=BATTERY%20VOLT%20TESTERS Yes, that's right -- $2.99. Cheap cheap! They're not the world's greatest, but they're dirt cheap, and they're pretty accurate, within 1% anyways for simple things like DC voltage. Add an appropriate resistor (like 15 ohms, 1 watt) in parallel and you've made yourself a fine ESV. (Of course, you can buy a multimeter anywhere, but you're not likely to find them this cheap.) I've used a number of these, and I really can't find anything that wrong with them. Sure, they don't do as many digits as some, and probably don't measure RMS AC voltage very accurately for something that's not a clean sine wave, but you can't beat the price. -- Doug McLaren, [EMAIL PROTECTED] I don't need a compass to know which way the wind shines! --Mr. Furious RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
Re: [RCSE] Stoopid battery question #764
Great question Joe. Not sure what indent represents. However, the negative (-) end is flat with no protrusions, and forms the side of the battery as well. The positive (+) usually will have a protrusion (button) which is electrically isolated form the bottom/sides. If you have a volt meter, you can touch both the top and bottom and observe polarity. If the red lead is on the positive, the VM will display a +V, if reversed you will see -V. Joe Parsons wrote: I'm making up a flight pack of 4 new NiMH 2/3 AAA cells. The polarity is not marked on the cells, but there's an indent at one end. Is that the positive? Joe Parsons RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
RE: [RCSE] Stoopid battery question #764
Just measure the voltage - if the red wire is on positive, you'll get some positive reading,or else a needle pinned to the left if red is on negative (with a digital MM, you'll get a negative voltage) Matt -Original Message- From: Joe Parsons [mailto:[EMAIL PROTECTED] Sent: Friday, April 23, 2004 5:33 PM To: RCSE Subject: [RCSE] Stoopid battery question #764 I'm making up a flight pack of 4 new NiMH 2/3 AAA cells. The polarity is not marked on the cells, but there's an indent at one end. Is that the positive? Joe Parsons RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
