We all wanna know if lipo break in is really useful and not a waste of time. I did my own experiment because I found myself feeling the same way as you. Take this for what you want, it's my own results. I purchased 3 of these specifically for one of my TCopters. I'm sorry I don't have a write up or anything, but here's what I have. I use a charger that measures internal resistance (Powerlab 8 v2 + 72A 24v PSU). In my opinion, outside of voltage sag and other obvious factors, internal resistance is the only way to monitor the true health of your battery. I labeled each battery (1,2,3) and dated them. Note: 'normal' flight for me can be any combination of docile or hard acrobatic flight (landing at 3.8V/cell and ice cold down to 3.2V/cell and quite hot. The initial IR of each batt was around 5-10 milliohms before first charge cycle and dropped to about 1-2 per cell after the first few charge cycles post flights. I did notice that battery 1 took longer for the IR to settle down closer to zero. Could just be a coincidence. Battery 1: No break in, charged @ 1C and flew normal. After first charge subsequent charges ranged from 2C to 4.5C. (4.5C being 10amps) Battery 2: One full cycle @ 1C and flew normal. 2C-4.5C charge rates . Battery 3: 3 full cycles @ 1C and flew normal. 2C-4.5C charge rates. I didn't treat any of them different. Flew hard some times, flew gentle other times. I always put them in storage charge (3.83/cell). Typically charge before flight in parallel from 15-30amps depending on time restrictions.Today all three Lipos are ~1 year old and in the neighborhood of 200-250 cycles each pack. For the most part, all three are just as strong as day 1. Battery 1 has a slight puff and I can 'feel' it start to sag toward the end of flights, while the other two I don't. Does this have anything to do with the break in? Impossible to say. As far as internal resistance goes, all three are still under 10milliohms. Battery 1 cells are in the range of 8-10 per cell, while Battery 2 and 3 are sitting around 5 per cell. My opinion: On these smaller packs, does it really matter? I don't think it makes much of a difference. I think your best bet when you get a new pack is to do one cycle at 1C or less just to monitor the voltage in each cell before your first flight. It's a great safety measure and a good part of a pre-flight maiden check if it's a new pack. On my big 6S 5000mah packs, however, I think it does matter. The cells are larger and I always do slow long cycles and monitor internal resistance closely before first flights. The main reason being I want to establish a steady internal resistance before I'm yanking 2000 Watts in a WOT vertical drop with my big bi-plane. Hope this was somewhat informative.