This looks pretty interesting. It's a Bluetooth monitor that logs battery performance from your phone. I'll give it a try for $40.
Voltage Test
https://shop.antigravitybatteries.c...battery/chargers/bluetooth-tracker-lead-acid/
Voltage Test
- Real-time Voltage reading.
- Real-time Voltage Graph over 5 minutes span.
- Voltage History Graph with 31 days of data.
- Real-time Charge percentage.
- General Charge status (“ok”, “charging”, “low charge”) with colored indicators.
- Automatically logs Cranking date and time on each Start attempt of vehicle.
- Actual Cranking Voltage reading.
- General Cranking Voltage reading (“ok”, “low voltage”) with colored indicators.
- Cranking Voltage Graph over the number of seconds the Start took place.
- Data stored for 1 day on the Cranking Test page but can be reviewed in Voltage History Graph that stores data for 31 days.
- The test has two steps with basic instructions for you to follow.
- Step 1 is an Idle Condition test.
- Step 2 is a High RPM Voltage test.
https://shop.antigravitybatteries.c...battery/chargers/bluetooth-tracker-lead-acid/