Citrus STEM Time Tellers

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Regular price $36.99 Save Liquid error (snippets/product-form line 69): Computation results in '-Infinity'%
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  • Zinc and copper plates
  • Clock
  • Wires
  • Lemons needed
  • Detailed instructions

The Citrus STEM Time Tellers is a fantastic green energy clock than be created with the power of a lemon! All that you need is to take a lemon from your home‰۪s kitchen and begin working with the provided STEM kit and instructions to put your green energy clock together. The STEM kit includes a clock, zinc and copper plates, and wires. Stick the plates inside the lemon and connect the wires from the plates inside the lemon to the clock.


  • Product Dimensions: 8 x 0.5 x 8 inches
  • Item Weight: 0.8 ounces
  • Recommended Age: 5 - 15 years

Our SmartKidsPlanet initiative began in 2017 when 3 geeky and dedicated parents saw a gap in the children’s toys and games market. An opportunity was spotted while we struggled to find toys and games for our kids which enriched their minds and guided them toward science, art, math and construction. The trio then knew that their paths were set, establishing an online shop with a comprehensive range of intelligent toys for babies, children and young teenagers.

With offices based in California, our SmartKidsPlanet team enjoys a daily growth in our presence within the children’s educational toys market. We love our new place in life, and we love helping young minds with their growth and skill development, all while having as much fun as possible.


We ship all our products directly to you from our warehouses located in multiple locations in the West and East Coasts.

Processing Time: All orders placed after 2 PM EST will be shipped the next business day. Orders placed after 2 PM EST Friday will be shipped on Monday. 

Orders are shipped and generally arrive within 2 to 3 business days after the order is processed. Tracking information will be sent via email once your order has been processed. The tracking number may not become active for 24 - 48 hrs.

Kindly take note that due to our business utilizing multiple warehouses within the United States, orders of more than one item may arrive as separate deliveries at different times. 

Orders made to PO BOX may take up to 12 days. Additionally, we do not ship to military bases. Hawaii and Alaska

Customer Reviews

Based on 6 reviews
Racquel Welch
Amazing little science kit

This is great for experimenting with what will run a clock / act as a battery. You can use it with just about any fruit / vegetable / liquid / solid / etc

Kim Hunter
I purchased from two different sources and wasted money. Then I saw this product and as ...

Was working with my son on his science project...we were initially going to use an led bulb but I could not find an led bulb that would work...I purchased from two different sources and wasted money. Then I saw this product and as a last resort purchased two in case one didnt work. They both worked like a charm!!! Ill start here first next time! It worked just as designed and I loved the fact that it also came with the copper and zinc rods.

Brian Kuckelman

Worked great! So EASY!!!

I tried to gather all the supplies for a fruit battery at a local hardware store.. I got the wrong stuff and it didnt work. And my son and I wanted to kill each other trying to get it to work. Wasted my money and time.

Betty Freddrickson
Was working with my son on his science project...we were initially going to use an led bulb but I...

My children thought this was an easy to do and understand activity. They checked their lemon clock throughout the day! Easy, affordable little kit to do on the weekend.

Gabriela Mandescu
Exactly what we needed for a quick science project

My daughter needed a small science project on electricity and per her teacher's instructions, she couldn't buy a kit.
This straddled the lines between 'not a kit' and homemade project (teacher okayed it as a 'supply').
Simple, fully functional, reusable. Easy to clean (because hello sticky acidic lemon juice!)




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