Lithium or Not ?

[BUDDYonRC at aol.com]

Question about lithium packs, I hear that lithium cells fail open and if you 
experience an open cell it's all over 0 volts out and that lithium packs have 
an over current safety switch built in to prevent over heating in case the 
current charge or discharge is to high is this true? 
I currently use 1100 mah NiCad 4 cell pack's and know if a cell fails you 
still have three cells that may get you down safely, in fact I had have this 
happen once. 
Other than a slight weight savings and more flight time are there any other 
advantages / disadvantages with lithium packs. 
Also my in-flight battery failsafe will not work properly if higher voltage 
packs are used, can this be reset to function with higher voltage packs 
regulated or UN regulated on the Futaba 9 ZAP PCM radio system?
Buddy    
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