[morcheeba]

For a typical 70AHr car battery, the 1 mA from this monitor will take 8 years to drain the battery. When you get a "25% remaining" alert, you only have 2 years to recharge it! No, seriously, the self-discharge is about an order of magnitude greater than this monitor.

[dotancohen]

That might have been true decades ago, but modern ICE car batteries are designed for providing high cranking amps, not longevity under constant trickle. And even occasionally getting under 12 volts (12.6 is full) will damage them. That is the trade off of making the battery lighter and smaller. You'll notice that alternators and vehicle electrical systems have changed, too.

This is a big problem with aftermarket dashcams that continue to monitor the surroundings when the vehicle is parked.

[vardump]

Are you talking about the new Li-ion ICE car batteries or older lead-acid ones?

[dotancohen]

Lead acid, hence the reference to 12.6 volts. Are the Li-ions 12.6 volts as well? I thought they might be 16 volts.

[vardump]

There are some Li-ions that are supposedly drop-in replacements. However I think many are 16 volts.

There's some push to go to 48V+ Li-ions. We shall see.

[aembleton]

I think he's talking about the AGM lead acid ones.