An update over my previous post.....
I believe users whom have bought this model have used it for close to 2yrs or slightly over 2yrs so warranty is definitely over. A check with the importer of my CR300HD that to replace the internal battery, the cost of battery and shipping costs to and fro S.Korea will set me around SGD$70 and lead time about 3 weeks.
Since then I have googled the links on how to dismantle the set:
Link courtesy from blackboxmycar.com
How to dismantle unit
Replacement battery can be bought in SLS #02-70 Unicell Pte Ltd
Costs around SGD$7
IMPORTANT NOTE
You need to retain the original PCB board that comes with the CR300HD internal battery and solder the (+) and (-) terminals of the new battery to the CR300HD original PCB board
Picture link can be found here, courtesy from dashcamtalk.com
Link
Basically you need soldering tool kit to do the job, you may try your luck with SLS backlane shops that does repair of laptops or HPs to help you solder the terminals for a token fee ranging $2-5
Lastly, wish bros here good luck!