what should a Life battery be charged to at max voltage?
protek 2100 Futaba pack 6.6 volts.
the icharger defaults at 3.6 per cell, should I adjust it down to 3.3 per cell?

3.6 per cell is OK

As an 2S LiPo is specified with 7.4v it is charged with 8.4v.
The same counts for LiFePo4. Battery is specified at 6.6v but is charged at 7.2v

thank you Roelof, going to start the 20 cycle break-in

Why are you breaking in a receiver pack? Especially 20 cycles?

20 cycle break-in is recommended by protek for the futaba life transmitter pack.

You're expected to do a 20 cycle break in for a battery that gets sipped on at 50 milliamps by a transmitter.

No wonder why I hated my Protek battery in my m17 and why I like the pack I made from an old race pack. Their cells are pure trash.

Unnecessary. Wear it out with 20 cycles so they can sell you a new one. Never heard of this for a TX pack.

that may be the case, this is the first I’ve heard of breaking in a pack like this also. Below is copied directly from Amain’s site-

NOTE: Brand new LiFePO4 batteries have been found to fail prematurely if they are deep discharged below below 33% capacity too early. A break-in period of 20 cycles is currently recommended. While testing has shown that this battery can be charged at up to 3C rates, it is recommended that this battery not be charged at rates higher than 1C to maximize the lifespan of the battery. Additionally, LiFe batteries should not be discharged below 2.5V per cell to avoid pre-mature failure and maximize battery life span.

They probably just mean don't let it go below 33% for the first 20 runs.

+1 I've been in the hobby 30 years and never heard of cycling a battery 20 times to break it in.