I have a related but different issue. I just bought an i6 battery on Ebay for my Metro. Unlike the indicator lights on my original pack, which light while the bike is charging and also when the power is on, the lights on the Ebay pack only come on when the button under them is pressed. They don't stay on, or come on while charging or while the bike is powered up. The pack was supposedly lightly used, but since it arrived with 49.9 volts I'm wondering if it's actually new. I'm going to fully charge it tomorrow, and then take it for a longish test ride. I don't expect the behavior of the charge lights to change, though, and I'm wondering if this indicates a possible problem with the pack.
I think your pack sounds like it will be fine but please report back. I've got several of these Dorado batteries from different sources and they all behave slightly different (including 2 batteries from the same vendor). They charge slightly different and they operate slightly different. Worse they all operate slightly differently themselves depending on what their mood is. On the charge lights and on/off I've experienced a vareity of behaviors:
1) Take off charge, no leds, plug into bike, bike powers up
2) Take off charge, no leds, plug into bike, power battery on, leds light briefly, bike powers up
3) Take off charge, no leds, plug into bike, power battery on, leds stay lit, bike powers up
4) Leds on while charging, Take off charge, no leds, plug into bike, bike powers up
Just tons of variations and similar things when charging. And I've seen the same battery behave in various ways that I cannot predict. All are small little variations on the above, the batteries always work and never give trouble so I ignore their little quirks. Mostly it's put the battery in, turn on the battery just in case, turn on the bike.
If you don't mind me asking what does a used/nearly new Dorado go for on ebay? And what capacity is it, 14ah, 16ah, etc?