Author Topic: Double your battery life  (Read 5809 times)

banjineer

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Re: Double your battery life
« Reply #105 on: January 09, 2022, 02:07:43 PM »
This is a great idea and thread.  If / when the next batch happens please add me to the list for 2....

BadNews

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Re: Double your battery life
« Reply #106 on: January 09, 2022, 02:27:47 PM »
Hi DickB,

I wont get my Radrunner 2 for a few more days, but, I also would like to be on your list for your next batch.

murbot

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Re: Double your battery life
« Reply #107 on: January 14, 2022, 06:58:53 AM »
A switch like this with the option to disable it should already included as part of the battery. License it, get it done.

smunsey

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Re: Double your battery life
« Reply #108 on: January 14, 2022, 08:46:04 AM »
Please add me for two as well.  Second RadMini due to arrive Tuesday!

Thanks,
SMunsey
« Last Edit: January 14, 2022, 11:20:38 AM by smunsey »

handlebar

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Re: Double your battery life
« Reply #109 on: January 17, 2022, 04:19:50 PM »
Probably just meter accuracy. My meter is specified as +_1.2% accuracy, so that's +- 0.5V.  Probably just a variation in meters.  I have two DVMs that do read within 0.1V on the Rad battery, but I have one that I got for free at Harbor Freight and it's different by almost 1 V.

Next time I order parts I'm going to get a Maxxim MAX6350 voltage reference IC and check it out against my DVMs.

In 2015, I paid $11 for this item:
https://www.amazon.com/gp/product/B00NL419KW/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

All I had to do was solder on leads for two 9 volt battery connectors. Since then, I have once sprayed the selector switch with contact cleaner. It was calibrated and came with a paper showing each of the four voltages to the nearest 0.01 millivolt.

It's advertised as an AD548. In fact, it's an AD584. The item I bought is out of stock, but searching for AD584 brought up quite an assortment.

I'm amazed at how accurate some cheap meters are these days.

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