kinsell wrote on 3/16/2019 9:46 PM:


Many of us are flying with multi-cell LiFePO4 batteries that have internal
wiring and are not filled with resin.* Is that a problem?* Or is the location of
the batteries in this specific glider such that the resin is advisable?* A
battery fire anywhere in a glider (even without a fuel tank) is catastrophic.
OTOH I havn't heard of any fires with this type of battery.* It's the
lithium-polymer battery pack (also much larger, with many more cells) in the FES
systems that has had fires.


Well, the service bulletin talks about an LFP that burned.* There was a fire in an
EB-28 in Finland last year with a 10 A-H LFP.* Here's a video of an LFP burning:

https://www.pilotsofamerica.com/comm...-fires.102016/


There have been claims that LFP's don't burn, but that's simply not true.

The Aerovoltz battery that burned did not have a BMS; in fact, none of the
Aerovoltz batteries have a BMS (battery management system). I would not want to
use one, even though the short engine runs typical of self-launchers means
problems would be less likely than in airplanes. The Earth-X batteries all have a
BMS, seem better characterized, and I would trust them a lot more.

--
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
- "Transponders in Sailplanes - Dec 2014a" also ADS-B, PCAS, Flarm

http://soaringsafety.org/prevention/...anes-2014A.pdf