Products > Test Equipment
BM550 automotive battery tester
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firewalker:
Recently I bought a cheap (~20 USD) automotive battery tester from Alixpress. The model number is BM550.

https://www.aliexpress.com/item/1005003477765500.html

You set the voltage and the CCA of the battery and it returns Status Of Heath (SOH) %, Status Of Charge (SOC) %, Internal Resistance in mOhm and CCA.

The overall construction seems to be OK. Nice soft cables and strong clamps. The viewing angle of the screen is terrible though.

 It uses 4-wire method for the measurements. It doesn;t seem to measure the internal resistance using the AC method though. It just uses 100 mA current pulses (measured with a 1 mV/10 mA current clamp). I don;t have another quality tool to double check it.

It uses a China made mcu. Synwit SWM181CBT6-50. And another laser etched chip (just an amplifier?).

SWM181CBT6-50: http://www.lookmcu.com/pdf/622338.pdf
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