Sadly,I have to spoil the symmetry of praise.
Having seen the 4900 ,20c., Rhino packs perform well, as 5Sx2 (10S) F3A packs in a club colleague’s model, I ordered two sets of 10S packs.
One set charged up routinely.
The other set showed one cell (no2) as having a large(3.84 v. 4.1-odd) voltage imbalance initially, but after an extended low-amp “safety charge” with the Cellpro charger, all balanced out OK, at around 4.2 V per cell.
Just in case of problems, I set the flight timer at just 5 minutes as against my usual 8, in a typical APC20.5x14, Plettenberg 30-10 Evo, jeti spin 99, 2M pattern plane set up.
Smoke caused me to land and terminate the first flight after approx 4 minutes.
Here are the two packs:
[URL=http://img263.imageshack.us/i/img0501i.jpg/]
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With hindsight, it was foolish to even try the doubtful pack-but now , should I try the other pack , or just chuck the lot, and mark it down to experience?