# Electron E series - LiPo terminal voltage limitations **URL:** \ **Category:** Hardware\ **Tags:** electron\ **Created:** [February 25, 2019, 4:07am UTC](https://community.particle.io/t/electron-e-series-lipo-terminal-voltage-limitations/48009 "2019-02-25T04:07:06Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![sreeharsha.angara](https://avatars.discourse-cdn.com/v4/letter/s/9de0a6/32.png) [@sreeharsha.angara](https://community.particle.io/u/sreeharsha.angara)\ **Post date:** [February 25, 2019, 4:07am UTC](https://community.particle.io/t/electron-e-series-lipo-terminal-voltage-limitations/48009/1 "2019-02-25T04:07:06Z")
Hi, I’m close to finishing my prototype board using the electron E-series and I have a question regarding the input voltage. The application is entirely battery powered with no rechargeable function. I’m planning to use 3xAAA batteries(~3000mAh) to power the electron and swap out the batteries when needed. Nominally 3x in series will give ~5.0volts, drops over time. Now, the datasheet specifies that the LiPo terminal is the most efficient way to power the module but has a 3.6v~4.4V. Will it tolerate the 5.0V or am I forced to use the VIN terminal in this case. Cheers ---
**Author:** ![rickkas7](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/rickkas7/32/8681_2.png) [@rickkas7](https://community.particle.io/u/rickkas7)\ **Post date:** [February 25, 2019, 10:10am UTC](https://community.particle.io/t/electron-e-series-lipo-terminal-voltage-limitations/48009/2 "2019-02-25T10:10:14Z")
The value is based on the bq24195 PMIC. According to the datasheet, the recommended maximum input voltage on VBAT is 4.4V. The absolute maximum rating is 6.0V. In my opinion, 5.0V is too high above 4.4V to be safe and you should use VIN. If you do use the LiPo connector, make sure you disable charging and the charge safety timer. ---
**Author:** ![sreeharsha.angara](https://avatars.discourse-cdn.com/v4/letter/s/9de0a6/32.png) [@sreeharsha.angara](https://community.particle.io/u/sreeharsha.angara)\ **Post date:** [February 25, 2019, 4:03pm UTC](https://community.particle.io/t/electron-e-series-lipo-terminal-voltage-limitations/48009/3 "2019-02-25T16:03:47Z")
Brilliant! Thanks for the quick reply. To clarify your last point, I’m assuming API’s are available to disable both the features? Best ---
**Author:** ![ninjatill](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/ninjatill/32/17370_2.png) [@ninjatill](https://community.particle.io/u/ninjatill)\ **Post date:** [February 25, 2019, 4:22pm UTC](https://community.particle.io/t/electron-e-series-lipo-terminal-voltage-limitations/48009/4 "2019-02-25T16:22:45Z")
I think you want to look here: [https://docs.particle.io/reference/device-os/firmware/electron/#charge-timer-control-reg](https://docs.particle.io/reference/device-os/firmware/electron/#charge-timer-control-reg) and here: [https://docs.particle.io/reference/device-os/firmware/electron/#charge-timer-control-reg](https://docs.particle.io/reference/device-os/firmware/electron/#charge-timer-control-reg) ---
**Author:** ![rickkas7](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/rickkas7/32/8681_2.png) [@rickkas7](https://community.particle.io/u/rickkas7)\ **Post date:** [February 25, 2019, 4:26pm UTC](https://community.particle.io/t/electron-e-series-lipo-terminal-voltage-limitations/48009/5 "2019-02-25T16:26:29Z")
The full code is here, but omit the line to disable the BATFET. You need to leave the BATFET enabled, otherwise you can't power from the LiPo battery connector. The other lines of code will prevent charging and prevent the LED from flickering or blinking. > [@Disabling the Electron red charging LED when not using the LiPo](https://community.particle.io/t/disabling-the-electron-red-charging-led-when-not-using-the-lipo/26604): > > If you are in a situation where you have a power supply on VIN that can support 1800 mA and do so very quickly, it is possible to use the Electron without the LiPo battery. One use case for this high or low temperature environments, outside of the range of the LiPo. I think I discovered the settings you must make to disable the battery and charging completely. I had missed the watchdog before, and that would cause the charging light to start blinking at odd times, including when sleeping. Then …