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  1. Testing a cheap Li-Ion 18650 cell

    Batteries and Charging
    I just finished a discharge test on one of the Li-Ion cells I bought on eBay at the price of $14/4 pieces including shipping. It is rated for 3600 mAh but my test as received showed only 530 mAh. Here's what I did: Now I need to charge it (while using the datalogger), and then another...
  2. Mythbusters: Does Lead Weight = Energy Capacity?

    Batteries and Charging
    So, I was recently told that the weight of a lead battery determines how much energy it can store. I'm starting to think that they just meant that as an approximation because I always thought design could have an effect as well. Lead-Acid has become better from 50 years ago right? Also, if...
  3. how much towing power for how long?

    Non Road Going Vehicles
    hi, I need a good strong ATV for my ranch, and after seeing how well electric ATVs perform Im considering building one, however, I haven't witnessed or found any information regarding towing capacity, Im looking to spend 3000$ or less, and need something that can tow up to 500lbs, and run for at...