Hi everyone, I've always like flashlights but recently am getting into rechargeable lights running on 18650's. So I'm sure this is a total newbie question but any help here would be much better than it seems I'm getting on google. I'm looking at buy a Nitcore MH27UV and I happen to have an extra 18650 left over from an Olight S2R. Now I'm curious if this 3.6v 3600mah 12.9Wh battery would work well inside of the new MH27UV? I thought all 18650's were the same besides the mah rating but then I came across something on a site saying how a light needs a battery with at least an 8a rating (what the heck does that mean?!). Again...I'm sure I sound like a total newbie and I'm sure it's something obvious that I'm missing but any help would be greatly appreciated. Thank you.