Accurate chargers!
Be careful about indicated and measured voltages, some chargers do not accurately indicate the on charge voltage, it all depends on how well they have been calibrated.
Similar can be said of commercial volt meters, there are good and bad when we are talking two or even three decimal places, good ones like the Fluke range can be very expensive depending on their intended application as the calibration standard will vary.
I once watched a video of a guy recalibrating a Thunder Power twin port charger to the third decimal place against a laboratory standard voltmeter and this did indicate the amount of error that can be present, even in a 'quality' charger!
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