Richard Pfiffner wrote on 6/2/2020 9:26 AM:
....


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.

Were they Bioennos with a BMS that protects against overvoltage? For example, I
use the BLF-1220AS, which ....

"Includes built-in PCM (protection circuit module) which provides internal cell
balancing and management, protection from overcurrent, undervoltage
(overdischarge), overvoltage and short circuiting, and has integrated charging
circuitry "

I haven't tried applying 24 volts to it, but I'd expect it to protect against 24
VDC being applied to it. I've just emailed Bioenno this question, but have not
heard back.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1