# Rtc battery of pironman 5 **URL:** \ **Category:** General\ **Created:** [June 10, 2024, 3:42am UTC](https://forum.sunfounder.com/t/rtc-battery-of-pironman-5/1197 "2024-06-10T03:42:49Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Weirdyguy](https://avatars.discourse-cdn.com/v4/letter/w/d78d45/32.png) [@Weirdyguy](https://forum.sunfounder.com/u/Weirdyguy)\ **Post date:** [June 10, 2024, 3:42am UTC](https://forum.sunfounder.com/t/rtc-battery-of-pironman-5/1197/1 "2024-06-10T03:42:49Z")
The RTC battery included with pironman 5, is it rechargeable?and how can I check its stat of charge? ---
**Author:** ![SteveM](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.sunfounder.com/stevem/32/412_2.png) [@SteveM](https://forum.sunfounder.com/u/SteveM)\ **Post date:** [June 11, 2024, 6:10am UTC](https://forum.sunfounder.com/t/rtc-battery-of-pironman-5/1197/2 "2024-06-11T06:10:23Z")
Mine came with a CR1220 battery which is not rechargeable. I bought an ML1220 which is rechargeable. Then you have to alter the configuration of the RPi to enable the charging circuit. You can check the battery voltage with the following command: `vcgencmd pmic_read_adc BATT_V` ---
**Author:** ![SunFounder\_Moderator](https://avatars.discourse-cdn.com/v4/letter/s/34f0e0/32.png) [@SunFounder\_Moderator](https://forum.sunfounder.com/u/SunFounder_Moderator)\ **Post date:** [June 11, 2024, 10:20am UTC](https://forum.sunfounder.com/t/rtc-battery-of-pironman-5/1197/3 "2024-06-11T10:20:58Z")
SteveM is correct. You can refer to the tutorial link for a detailed explanation:[USB HDMI Adapter — SunFounder Pironman documentation](https://docs.sunfounder.com/projects/pironman5/en/latest/advanced/hdmi_adapter.html) ---
**Author:** ![Weirdyguy](https://avatars.discourse-cdn.com/v4/letter/w/d78d45/32.png) [@Weirdyguy](https://forum.sunfounder.com/u/Weirdyguy)\ **Post date:** [June 11, 2024, 10:35am UTC](https://forum.sunfounder.com/t/rtc-battery-of-pironman-5/1197/4 "2024-06-11T10:35:18Z")
Thanks for the info. ---
**Author:** ![Weirdyguy](https://avatars.discourse-cdn.com/v4/letter/w/d78d45/32.png) [@Weirdyguy](https://forum.sunfounder.com/u/Weirdyguy)\ **Post date:** [June 11, 2024, 3:27pm UTC](https://forum.sunfounder.com/t/rtc-battery-of-pironman-5/1197/5 "2024-06-11T15:27:54Z")
Is that normal, my Pironman 5 case is new, 1220 is new and is show that : BATT\_V volt(25)=0.00085470V ? not supposed to be around 3 V? Is it drained when case is OFF? ---
**Author:** ![SunFounder\_Moderator](https://avatars.discourse-cdn.com/v4/letter/s/34f0e0/32.png) [@SunFounder\_Moderator](https://forum.sunfounder.com/u/SunFounder_Moderator)\ **Post date:** [June 14, 2024, 7:13am UTC](https://forum.sunfounder.com/t/rtc-battery-of-pironman-5/1197/6 "2024-06-14T07:13:28Z")
Yes, under normal circumstances, the battery voltage is around 3V. 1.Please remove the CR1220 battery and use a multimeter to measure the voltage. If there is no voltage, then the battery is dead; if the battery has voltage, then there is an issue with the wiring terminal. 2.Unplug the RTC wiring, check the RTC interface socket of the USB HDMI adapter, and see if the pins inside are vertical, to ensure that the 2P cable interface is in full contact with the socket pins. If the socket pins are not properly connected to the 2P cable interface, causing the socket pins to be skewed, you can use a tool to straighten the pins. After reassembly, restart the pironman5, then run vcgencmd pmic\_read\_adc BATT\_V to check the voltage result. ---
**Author:** ![Weirdyguy](https://avatars.discourse-cdn.com/v4/letter/w/d78d45/32.png) [@Weirdyguy](https://forum.sunfounder.com/u/Weirdyguy)\ **Post date:** [June 14, 2024, 3:41pm UTC](https://forum.sunfounder.com/t/rtc-battery-of-pironman-5/1197/7 "2024-06-14T15:41:19Z")
I dissemble the case to reach RTC battery, put multimeter on it, 152.8 mV. If the power supply is remove from case a few days, does it drain the RTC battery, as CMOS battery on motherboard PC? Or I received a bad battery? ![20240614_113645](https://canada1.discourse-cdn.com/flex029/uploads/sunfounder/original/1X/09f03c976b3eaca3bf33d34b826d6be860ad61a6.jpeg) ---
**Author:** ![SunFounder\_Moderator](https://avatars.discourse-cdn.com/v4/letter/s/34f0e0/32.png) [@SunFounder\_Moderator](https://forum.sunfounder.com/u/SunFounder_Moderator)\ **Post date:** [June 17, 2024, 9:38am UTC](https://forum.sunfounder.com/t/rtc-battery-of-pironman-5/1197/8 "2024-06-17T09:38:32Z")
It’s possible the battery you received was discharged. We will arrange to send you.Please contact us at [service@sunfounder.com](mailto:service@sunfounder.com) ---
**Author:** ![Weirdyguy](https://avatars.discourse-cdn.com/v4/letter/w/d78d45/32.png) [@Weirdyguy](https://forum.sunfounder.com/u/Weirdyguy)\ **Post date:** [June 27, 2024, 11:03pm UTC](https://forum.sunfounder.com/t/rtc-battery-of-pironman-5/1197/9 "2024-06-27T23:03:30Z")
I’ve received new CR1220, install it, and now it show 3.32V, thanks for your help!