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-   -   Motor analyzer minimum battery mah (https://www.rctech.net/forum/radio-electronics/1119735-motor-analyzer-minimum-battery-mah.html)

staiguy 01-06-2024 07:28 PM

Motor analyzer minimum battery mah
 
Can I use a 2s battery from my mini b? It’s the protek one. I don’t have a discharger and it would take forever for my 5000 to discharge at 2 amps. The mini b one is 1100. Is that enough for just testing purposes?

thanks

Sabin 01-08-2024 12:08 PM

No, because the pack will have too much voltage sag. It's better to use a pack rated higher than 6000mah.

OffRoadJunkie 01-08-2024 01:15 PM


Originally Posted by staiguy (Post 16064423)
Can I use a 2s battery from my mini b? It’s the protek one. I don’t have a discharger and it would take forever for my 5000 to discharge at 2 amps. The mini b one is 1100. Is that enough for just testing purposes?

thanks


Which analyzer do you have? I use a 4000 and it works just fine. When I'm testing multiple motors, I have another 4000 as a backup.

gigaplex 01-08-2024 01:41 PM


Originally Posted by Sabin (Post 16064861)
No, because the pack will have too much voltage sag. It's better to use a pack rated higher than 6000mah.

Voltage sag at no load will be very small.

staiguy 01-08-2024 02:24 PM


Originally Posted by OffRoadJunkie (Post 16064880)
Which analyzer do you have? I use a 4000 and it works just fine. When I'm testing multiple motors, I have another 4000 as a backup.

The skyrc one. I plan on only doing one at a time per charge, not multiple in a session.

OffRoadJunkie 01-08-2024 04:55 PM


Originally Posted by staiguy (Post 16064913)
The skyrc one. I plan on only doing one at a time per charge, not multiple in a session.


I see no issue with using the 1100 for a single motor run. You're not putting any load on it and you're only running it for 10 seconds. Heck, we use to run 27t motors on 1200mah batteries for 4 minutes, with a load.

staiguy 01-09-2024 07:46 AM


Originally Posted by OffRoadJunkie (Post 16064969)
I see no issue with using the 1100 for a single motor run. You're not putting any load on it and you're only running it for 10 seconds. Heck, we use to run 27t motors on 1200mah batteries for 4 minutes, with a load.

your bringing me back to when I had to save all the cash I got for christmas and buy a 1600mah nicd. maybe a 5 minute run

glennhl 01-09-2024 09:38 AM


Originally Posted by OffRoadJunkie (Post 16064969)
I see no issue with using the 1100 for a single motor run. You're not putting any load on it and you're only running it for 10 seconds. Heck, we use to run 27t motors on 1200mah batteries for 4 minutes, with a load.

I started in RC in 1982 with a 12i and we would run the 1200 mah nicads for 8 minutes. The trick was to gear it just high enough that for the last lap you were running slower but not dead.

And back to the OP, it looks like the mini B battery is a 2S 650 mah. That will work perfectly fine. The motor runs unloaded, it doesn't pull hardly any amps.

OffRoadJunkie 01-10-2024 11:18 AM


Originally Posted by glennhl (Post 16065201)
I started in RC in 1982 with a 12i and we would run the 1200 mah nicads for 8 minutes. The trick was to gear it just high enough that for the last lap you were running slower but not dead.

And back to the OP, it looks like the mini B battery is a 2S 650 mah. That will work perfectly fine. The motor runs unloaded, it doesn't pull hardly any amps.


Yup!
I remember those days. gear the motor to dump at 5 minutes. Many will push it to 4.5 minutes, but often end up suffering an early battery dump before the 4 minute race is over. those motors would be smoking hot after each run. We had to come up with all kinds of heatsink designs to cool them off.

Ah... the good ole days.


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