MOSFET Astable: NP-BX1 Rundown

After eight months from a full charge, an old NP-BX1 lithium battery has come to this:

Astable green - NP-BX1 - 2.31 V
Astable green – NP-BX1 – 2.31 V

The astable still ticks along at 1.4 seconds per blink, but the green LED barely lights up from a 2.1 V battery:

Astable green - NP-BX1 - 12 mV 100 ohm
Astable green – NP-BX1 – 12 mV 100 ohm

A pulse of 12 mV across the 100 Ω resistor puts the LED current at a mere 120 µA: no wonder the poor thing wasn’t visible in ordinary room light.

Another full charge restored its vigor for another couple of seasons.

3 thoughts on “MOSFET Astable: NP-BX1 Rundown

    1. And it was the Genuine OEM Sony battery, too! [grin]

      I was hoping for a year. Maybe a pair of fresh alkalines will get there?

Spam comments get trashed, so don't bother. Comment moderation may cause a delay.

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s