# 2018 battery gauge & charging

**URL:** <https://community.electricforum.com/t/2018-battery-gauge-charging/30232>\
**Category:** GEM Forum\
**Tags:** chargers\
**Created:** [March 9, 2026, 3:58pm UTC](https://community.electricforum.com/t/2018-battery-gauge-charging/30232 "2026-03-09T15:58:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Shafri](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@Shafri](https://community.electricforum.com/u/Shafri)\
**Post date:** [March 9, 2026, 3:58pm UTC](https://community.electricforum.com/t/2018-battery-gauge-charging/30232/1 "2026-03-09T15:58:17Z")

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Hi all

I have a 2018 e2 that I added an aftermarket lithium pack to. The onboard factory charger charges at 4a and finishes off at 16a. Aftermarket ones go at 16a. How can i program the factory one to give 16 the whole time?

The next that you have is the battery gauge doesn’t display the correct amount of battery life, my battery reaches about 50% the vehicle turtles. How can I reprogram the battery gauge. Thanks for the help

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**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\
**Post date:** [March 9, 2026, 4:11pm UTC](https://community.electricforum.com/t/2018-battery-gauge-charging/30232/2 "2026-03-09T16:11:46Z")

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You can try having the OEM DQ charger reprogrammed for lithium battery. Doesn’t always help. Ask your battery seller. He can also show you how to spoof the bmc for a larger battery..