Author Topic: FX Radar Low batteries  (Read 134 times)

Alan

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FX Radar Low batteries
« on: December 29, 2021, 01:59:36 PM »
If you want accuracy out of your FX radar chronograph, then make sure the batteries are fresh. The velocity was consistent, but 20 FPS low. New batteries, right back where it should be!


  • Roswell, New Mexico
Alan

I have a Hill EC-3000 compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your tank as a courtesy (4,250 PSI limit).

steveoh

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Re: FX Radar Low batteries
« Reply #1 on: January 07, 2022, 07:10:08 AM »
I noticed they changed the UI for the FX Radar app and it’s improved though I still have usability issues here and there. Also noticed they recommend Energizer® Ultimate Lithium™ Batteries.

For sure run of the mill alkaline batteries and rechargeable batteries are less than optimal.
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nervoustrigger

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Re: FX Radar Low batteries
« Reply #2 on: January 10, 2022, 07:04:00 AM »
I finally got tired of swapping batteries so I added a DC socket for connecting up a USB battery pack:



There's already a spot on the board with a couple of pads to accept it and I found an old USB hub with a socket that matched up so I robbed it from there:



Be advised they did not include steering diodes on the board...meaning if I have batteries installed and connect up the DC cable, the batteries will be getting charged in an uncontrolled manner.  That's no bueno.  Don't do it.

Side note, the battery pack I'm using needs a minimum load of 100mA to stay awake.  The chronograph draws ~80mA so I soldered a 200 ohm 1/4W resistor across the cable to kick it over 100mA.  Oh, the irony of throwing away over 20% to make this thing more useful.

With this done, I was able for the first time to use my FX chronograph with leisure and test several guns over the course of 2 hours and the battery pack's 4-bar gas gauge never budged.  Even with the small one I'm using rated 4.8Ah, the available run time is on the order of 25 hours (allowing 15% for conversion losses).  That will do nicely.
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Alan

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Re: FX Radar Low batteries
« Reply #3 on: January 10, 2022, 07:23:34 AM »
I though about doing the same thing. However, I was just going to remove the batteries rather than worry about charging them, and power the unit from a USB plug-in supply.

I would think whole ever designed the unit, were probably aiming at a price point. But it would have been nice to pay a bit more, and get the functionality along with an external plug-in supply. Or rechargeable batteries?
  • Roswell, New Mexico
Alan

I have a Hill EC-3000 compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your tank as a courtesy (4,250 PSI limit).

steveoh

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Re: FX Radar Low batteries
« Reply #4 on: January 10, 2022, 07:40:21 AM »
I finally got tired of swapping batteries so I added a DC socket for connecting up a USB battery pack:



There's already a spot on the board with a couple of pads to accept it and I found an old USB hub with a socket that matched up so I robbed it from there:



Be advised they did not include steering diodes on the board...meaning if I have batteries installed and connect up the DC cable, the batteries will be getting charged in an uncontrolled manner.  That's no bueno.  Don't do it.

Side note, the battery pack I'm using needs a minimum load of 100mA to stay awake.  The chronograph draws ~80mA so I soldered a 200 ohm 1/4W resistor across the cable to kick it over 100mA.  Oh, the irony of throwing away over 20% to make this thing more useful.

With this done, I was able for the first time to use my FX chronograph with leisure and test several guns over the course of 2 hours and the battery pack's 4-bar gas gauge never budged.  Even with the small one I'm using rated 4.8Ah, the available run time is on the order of 25 hours (allowing 15% for conversion losses).  That will do nicely.

Brilliant!

The FX radar sure eats batteries. But it’s so convenient otherwise, I cut slack on it.

Funny, I have several flashlights that use 18650 batteries and the generic rechargeable Chinese batteries sometimes work and sometimes don’t and longevity is always suspect. So I order some from eBay, so I can charge them up and have them at the ready. Couple days later I get this message from eBay:

Quote
Hello guldam,
We take product safety very seriously. We’re reaching out to you because an item you purchased may have been recalled or pose a safety hazard. We recommend that you stop using this product. If you have questions about the item(s), please reach out to the seller or the manufacturer. Item details are listed below.


Due to product safety concerns, these batteries are not allowed unless they are included with a product or accessory designed to use them. A charger is not accepted as an accessory.




If you have any problems, you’re covered by eBay’s Money Back Guarantee and can request a refund.

For more information, see:
https://www.ebay.com/help/buying/returns-refunds/get-help-item-hasnt-arrived?id=4042

Item details: 115170851309 - 4-8pcs 18650 3.7V 9800mAh Flashlight Li-ion Rechargeable Battery + Charger


If you have questions, please go to "Help & Contact" at the top of most eBay pages.
Thanks,
eBay

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archerhmr

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Re: FX Radar Low batteries
« Reply #5 on: January 10, 2022, 08:35:33 AM »
So where I live, it is regularly around freezing right now in the morning. The lithium batteries do not like the cold. Duracell works no problem. Above 40 though and energizer lithiums are fantastic.
Same thing happened with our work tools up at Tahoe. A bit colder there, the lithium batteries did not work well.

Airguns are just too fun, batteries, tripods, bags, velocity, pellets, slugs, tuning shroud. It never ends. All in the name of fun
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Alan

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Re: FX Radar Low batteries
« Reply #6 on: January 10, 2022, 01:20:46 PM »
Don't forget scopes!
  • Roswell, New Mexico
Alan

I have a Hill EC-3000 compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your tank as a courtesy (4,250 PSI limit).