# Does Shim indicate charging even when battery full?

**URL:** <https://forums.pimoroni.com/t/does-shim-indicate-charging-even-when-battery-full/28773>\
**Category:** Support\
**Created:** [March 15, 2026, 2:21am UTC](https://forums.pimoroni.com/t/does-shim-indicate-charging-even-when-battery-full/28773 "2026-03-15T02:21:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Art.Lieberman](https://avatars.discourse-cdn.com/v4/letter/a/d2c977/32.png) [@Art.Lieberman](https://forums.pimoroni.com/u/Art.Lieberman)\
**Post date:** [March 15, 2026, 2:21am UTC](https://forums.pimoroni.com/t/does-shim-indicate-charging-even-when-battery-full/28773/1 "2026-03-15T02:21:44Z")

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Regarding the Pimoroni Pico LiPo Power SHIM  
If power is plugged into the Pico, will the Shim indicate it is charging the battery even when the battery level is “full” (4.2)?

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**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\
**Post date:** [March 15, 2026, 8:14am UTC](https://forums.pimoroni.com/t/does-shim-indicate-charging-even-when-battery-full/28773/2 "2026-03-15T08:14:52Z")

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Suppling +5V via the Pico’s USB connector will trigger an automatic charging cycle. If the battery is fully charged it shouldn’t stay on very long.  
VBUS is what supplies the charging circuit.  
[pico\_lipo.sch](https://cdn.shopify.com/s/files/1/0174/1800/files/lipo_shim_for_pico_schematic.pdf?v=1618573454)

There was a time I was really up to speed on this stuff, retired now and time keeps on ticking ticking ticking. =)

There is some current sensing going on too. It’s protected against over charging so no harm will become of the battery.

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<div class="post-metadata">

**Author:** ![Art.Lieberman](https://avatars.discourse-cdn.com/v4/letter/a/d2c977/32.png) [@Art.Lieberman](https://forums.pimoroni.com/u/Art.Lieberman)\
**Post date:** [March 16, 2026, 12:44am UTC](https://forums.pimoroni.com/t/does-shim-indicate-charging-even-when-battery-full/28773/3 "2026-03-16T00:44:58Z")

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Yes, I now see that it is working properly. When the battery voltage gets high enough, it stops charging. It just had to get higher than I had expected.