Uploaded August 2025 | Updated September 2026, 2 days ago

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Why the battery indicator is so useless and how it can be improved …
↓↓↓ Complete description, time index and links below ↓↓↓

In the very first video about the Haswing Protruar 2.0 24V Trolling Motor I noticed that the battery charge indicator is completely useless (link below). So let’s find out what makes it tick and how we can improve it.

First we recap the problem with the battery indicator. Then we reverse engineer its circuit and measure its accuracy. After we determine why it’s so inaccurate we finally come up with some potential improvements to it.

00:00 Intro – a practically useless battery indicator
00:39 Problem – LEDs switching at 17.1V, 22.2V & 23.2V
02:46 Reverse engineering – I spare you the details
03:26 Circuit – voltage reference and quad comparator
07:00 Accuracy – large errors between 2.7% and 4.7%
08:53 Conformal coating – removed with acetone
09:43 Error source – it’s the voltage dividers’ resistors
13:36 Improvements – better resistors & other voltages
18:03 Wrap-up – now we wait for new resistors, bye

Teardowns youtube.com/playlist?list=PLwq-2MnM58FJPg01ooMBgy_CxDxAem0my
Haswing Protruar 2.0 24V Trolling Motor – Unboxing and First Impressions youtu.be/DSgi4pclBUA
Haswing Protruar 2.0 24V Trolling Motor – Teardown & Reverse Engineering youtu.be/I8f8282jB8g
Haswing Protruar 2.0 24V Trolling Motor – More Reverse Engineering youtu.be/RAsr5ENhv88
Haswing Protruar 2.0 24V Trolling Motor – Further Teardown youtu.be/Fr-SQFcZ-08
Haswing Protruar 2.0 24V Trolling Motor – Reverse Engineering Errata youtu.be/wXfeN3VplFE
Haswing Protruar 2.0 24V Trolling Motor – Battery Indicator Improvement youtu.be/7dKLdkXZMiQ

#reverseengineering #teardown #teardowns #haswing #trollingmotor #outboardmotor #outboard #robertssmorgasbord