1% battery new rMBR is it bad to drain it to that percentage?

Hello, fairly new to Macbook pro used an iMac for over 6 years.. but I've had my macbook pro retina for just under a week and lovin' it! But I was experiecing problems with battery life to what I thought. So i called Apple care and disccusessd this issue and they said that my battery seems to be more than in working order but he told me to reset the SMC and drain tha battery and recharge it to 100% so i used it as normal till it got to 1-2% and before it being completed dead in 5-10 mins I saw on the fourms that it's BAD to make the battery go to this level is this correct? and will it of have damaged my batterys life/performance from this one event even thought I didnt let the macbook die completely? I plugged in the charger at 1% with 7mins of usage left. Also is it normal for the Charge capacity to change numbers because it was 6965 and it has gone down to 6872 in a days use. Thanks

It's a very bad idea to drain the battery to 0%. Some batteries cannot recover and will no longer accept a charge. It's safer to take the battery down to 20% then recharge it.
Maximum charge capacity will decline over the life of the battery, but these batteries are intended to have pretty long lives.
About Batteries in Modern Apple Laptops
Apple - Batteries - Notebooks
Extending the Life of Your Laptop Battery
Apple - Batteries
MacBook and MacBook Pro- Mac reduces processor speed when battery is removed while operating from an A-C adaptor
Battery University
Apple - Batteries - iPod
Apple - Batteries - iPhone
Apple - Batteries - iPad
Apple Portables- Calibrating your computer's battery for best performance
Mac notebooks- Determining battery cycle count
How to Calibrate Your Mac, iPhone, or iPad Battery | MacBlend

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