Should'n it still be under warranty? If not, try this. Put your phone on video, lay it under the seat and shut it. Pull it out and see if the seat bucket light turned off when the seat was closed from the video. That's the only thing I can think of. If you replaced a good battery with another good battery (truly doubt they were/are bad) it was a waste of money, but I have done the same thing in the past. Im still on my O.E.M. battery at 10,000 miles in the first year. The longest my Burg. 200 has sat non ridden was 5 days straight/never started/no tender/in below freezing weather when it snowed. It was outside with a cheap cover on it. Started right up no problem. Under normal conditions it gets ridden everyday. Let us know what you find.
I think you hit the nail, because lately I didn't think to close my trunk box. I just dump my helmet in and left. I studied the wiring yesterday and discover that the trunk box light is directly hook up to the battery through the trunk switch. The Gel battery is 8AH and the trunk light is 3.4W, so it works out 0.283A and the battery will goes flat in about 28 hours, slightly over a day. OK, it sounds logical, so I will fit the battery up later. I think your video handphone method will definitely work.
I have charged the battery using the special Gel battery charger and the battery hold the voltage over a night. I think the battery survive this time round. Though the battery is still under warranty, cause is new, but is my mistake here. I will *REMEMBER* to close the trunk box from now on.
I didn't know there is a light in the trunk box, LOL. You see, I just passed my bike license and Burgman 200 is my first bike. So this always catch the inexperience rider, I think and Man!, it cost me One Gel $battery and a lot of time in it. Glad that it should be solved soon.
But Burgman should have installed some fail safe and fool-proof circuit out of this simple light switch problem that can kill a battery. Maybe like time-out circuit, some sought.
There is another thing I learnt out of this episode and want to share here. Jump-Start the scooter. That's why it killed the first battery. Because it's a gel battery and it don't like to be jump starter when the battery is flat because a lot of current will be charging the battery. Per my experience, the scooter alternator may also be damaged because it's not designed to rapidly charge the battery from zero and run the scooter. Fortunately the scooter engine stopped shortly because the alternator cannot supplied the current draw. Luckily for me, the alternator was not damaged. But I think I did put a strain on it. The first Gel Battery was damaged and had an internal short. So, never jump start when a Gel battery is installed. Expensive lesson learnt.
Thank you all.