Which Meter. Extech EX330 or Amprobe AM240 ?

[HKJ]

@agenthex

Unless this is necessary for some other enterprise, a super-accurate DMM to measure battery voltage is entirely pointless. The Vout is variable depending on load, so any crapo-meter with a “battery” mode (like the $3 harborfreight ones, which btw can be calibrated inside) are going to be more “accurate” than a fluke.

On a LiIon you uses the unloaded voltage, that makes a DMM perfect for the job.

For everyday use I do agree that a 4.xx reading is enough, but the tolerance on that reading is fairly high on some DMM's.

@agenthex

It’s also why getting thick leads are pointless for measuring current, too. The thin wire spring inside a tailswitch is going to offer far more resistance than any DMM probe.

Not all tail springs are thing and long, on the more powerful lights they are usual with thicker wire.