Battery Testing
03-18-2016 | 01:55 PM
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From: dayton,
OH
Battery Testing
I am using 5Amp, 45C, 2S LiPo batteries in my boats. I purchased an Internal Resistance meter and it came with no instructions. My batteries test in a range from.9 to 2.0 milli amps per cell. Is this ok? What is the normal range? The batteries are 1 year old. Anyone know where I can find specifications on testing LiPo batteries? Thanks
03-18-2016 | 05:00 PM
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The resistance is in Milli Ohms, not Milli Amps.
Here's a good article on this: http://www.rogershobbycenter.com/lip...po_discharging
Those readings are per Cell, not battery...many chargers only give you the per battery resistance, not individual cell ratings, so verify the readings before condemning a battery.
Google is your friend.....
Here's a good article on this: http://www.rogershobbycenter.com/lip...po_discharging
This begs the question: how low should it be? Unfortunately, there's no easy answer for this. It's all dependant on your use case and battery. What is great for one battery may be terrible for another. Based on my online research, combined with my own experience and findings, I would say, as a general rule, a per cell rating of between 0-6 mΩ is as good as it gets. Between 7 and 12 mΩ is reasonable. 12 to 20 mΩ is where you start to see the signs of aging on a battery, and beyond 20mΩ per cell, you'll want to start thinking about retiring the battery pack. But this is only a guide - there is no hard rule set here. And if your charger doesn't give you the per cell measurements, you'll have to divide your total count by the number of cells in your battery to get an approximate per cell rating.
Google is your friend.....
