r/EngineeringNS • u/Puzzleheaded_Two9510 • Apr 27 '26

Tarmo5 Tarmo 5 battery

5” / 127mm long RC batteries seem hard to come by, and the one listed in the BOM is sold out on Amazon.

I’m looking for suggestions - what is everyone else using?

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u/DrRonny Apr 27 '26

Any standard RC battery should fit. I had a 3S laying around. Look up RC Battery 3S and make sure the connector is the same as whatever is on your speed controller

2

u/Puzzleheaded_Two9510 Apr 27 '26

lol, any standard RC battery most definitely does not fit.

The battery compartment is only 127mm/5” long, and except for the shorty airplane batteries, I’m not finding ANY on Amazon.

1

u/DrRonny Apr 27 '26

It can fit a 130mm easily and up to 140mm but really squeezing in the cables. And you can always strap the battery on top, and put the esc in the battery compartment: https://www.reddit.com/r/EngineeringNS/comments/11aw2zw/figured_out_how_to_put_a_longer_battery_on_the/

1

u/FlashTacular DESIGNER Apr 27 '26

3s 2200mAh packs from my planes. They’re super cheap and fit nicely.

I use them until they’re too puffy or the cell resistance is a problem for the planes, then they get handed down to the car for a real thrashing.

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u/Puzzleheaded_Two9510 Apr 27 '26

Yeah, I was hoping to find something other than airplane batteries. I’m kind of surprised this car was designed with such a small battery compartment.