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Old 03-22-2019, 10:34 PM   #12 (permalink)
EcoCivic
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Quote:
Originally Posted by redpoint5 View Post
3x of these would put you at 48 Ah at $200, and 15v.

https://hobbyking.com/en_us/multista...lipo-pack.html
Well that's pretty cool, thanks! I don't know that much about lithium batteries, so these concerns may be invalid. However, I have a couple of concerns about using those batteries:
1. I am not sure how well they would handle heat. Since those are RC batteries, they probably don't need to be able to handle that much heat. However, my battery is installed in the trunk, and I am not sure how hot the trunk gets on a hot day, but I'm guessing pretty freaking hot.

2. How would those batteries be managed? From my understanding, lithium batteries need a fancy management system to protect the battery and operate safely. From my understanding, these BMS systems limit charge and discharge rates and provide overcharge and overdischarge protection. I am not sure what kind of battery management systems are available, but a BMS that could handle the current draw of the starter would probably be very expensive!

3. How long would these batteries last? So far my Optima battery is 11 years old and still works fine, which is pretty good IMO. How long would these lithium ion batteries last when used in a car? Could they match that kind of longevity?

4. You said these batteries can't be charged below freezing. My car gets parked in a garage overnight and stays above freezing, but what if I am not home and I need to park it outside overnight for whatever reason in the middle of the winter? Would the batteries self destruct or explode or something once I start the car and the alternator attempts to recharge them?
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