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K2 battery endurance
My Bioenno batteries worked just fine for several years.Â* Just sayin'...
On 6/2/2020 10:26 AM, Richard Pfiffner wrote: On Monday, June 1, 2020 at 9:46:09 PM UTC-7, kinsell wrote: On 5/25/20 9:47 PM, Eric Greenwell wrote: 2G wrote on 5/25/2020 2:20 PM: On Wednesday, May 13, 2020 at 8:00:09 PM UTC-7, kinsell wrote: ... The BMS in all LFPs may not have the same functionality regarding balancing but at the very least they should start/stop accepting charge appropriately. It matters not what you think should happen, the truth is not all LFP batteries have a BMS, and of those that do, not all of them protect from over and under voltage. Which LFP batteries don't have a BMS? Tom The "powersports" (ie, for engine starting) LFP don't always have a BMS. A motorglider pilot might be tempted to use one for the engine, for example. StarkPower had a series of batteries aimed at motorcycles that they were quite open about not having a BMS. Unfortunately they're in Chapter 7 now and the website is gone. More commonly, some batteries with BMS don't have over and under voltage protection. Richard Pfiffner one time was testing batteries, and his vendor shipped 24 volt chargers accidentally for 12 volt batteries. All the white stuff leaked out of the battery. Some electrical genius on R.A.S. (don't remember which one) declared that they really had overvoltage protection, but 24 volts just wasn't enough to trigger it. One of our fellow Schleicher motorglider pilots had an LFP, left the transponder on, and ruined the battery. A 15-20 AH battery intended as a starter battery can easily find it's way into other applications. You may have read about the ASG 32 mi that got fried when the solar controller malfunctioned, drained the battery, and got quite hot when charged from another charger. Did it have a BMS? Doesn't really matter. Dave The problem batteries were Bioenno Batteries. Richard -- Dan, 5J |
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