# Green light

**URL:** <https://community.electricforum.com/t/green-light/4213>\
**Category:** Battery & Chargers\
**Created:** [April 30, 2014, 3:19pm UTC](https://community.electricforum.com/t/green-light/4213 "2014-04-30T15:19:09Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rwales1](https://avatars.discourse-cdn.com/v4/letter/r/46a35a/32.png) [@Rwales1](https://community.electricforum.com/u/Rwales1)\
**Post date:** [April 30, 2014, 3:19pm UTC](https://community.electricforum.com/t/green-light/4213/1 "2014-04-30T15:19:09Z")

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I have a two seater GEM car, which I bought used in 2008. The Gel batteries we’re replace 18 months ago with red 12 volt acid batteries. I watch the water closely, and just topped off a few days ago. After charging all night, the car was pooped out, and only went 10 mph or less. I now have two yellow lights and a blinking green light. Underneath when you look under from left tire. Before, when charging, I only had 2 solid yellow lights. All batteries are 13 V or over, except on which reads 11.8 V. Any suggestions? (Total output voltage is 83 volts, so why is my Gem car in Turtle mode?). Should I buy hydrometer?