At right now at 50% volume, I manage to get around 25 hours or more. I do not keep track exactly but Its like forever until I need to recharge :)

Hi Bob, if the stock replacement batteries come with the BMS then it's simple as replace and plug in (as from the time I try to buy the stock one there is none in my country). Plz contact the provider.

But if the stock ones are only batteries then you need to reuse your BMS, required you to solder the battery into the BMS.

Yes, all the 03 batteries are parallel. Two on one side and One on the other side as you mention.

Right on it. I also nearly short circuit one of the battery, so yes have to be very careful. Thanks Vladimir

Thank you Mike for your opinions. My intention is to upgrade the stock battery with the 18650 batteries what are widely available. Plus, I am not very tech savy, my wish was to do a proper video for the whole process but do not have right equipments and time constraint.

I take the precaution, that’s why i use some plumping tape to water-proof around the two radiators. After done that, I have test in the rain first and throw in the swimming pool. It is fine, but of course don’t over do it over long period of time (5-10 min max). Under the rain is absolutely fine.

Hi MarkHarBet, the battery 26650 is too big to fit in the limited space within. So 18650 will be best option, I just barely manage to fit 3 in. Thx

I do not think so, because with extensive usage. My battery will die out after 1 year, plus with new model coming out, the stock battery will no longer available. So using 18650 batteries is best option. Once setup, just replace the batteries, even if they are not equalize probably, they are fine will definite last long. (also consider the cost is cheaper).

What do you mean?

if you would like to replace then plz contact my email, arnold.ng85@gmail.com. I’ll help and guide in my best knowledge but do not have time to do it for you :)