QUOTE(beck_ken @ Jun 5 2013, 10:27 AM)
that's why when charging, our car is very noisy....
for ppl asking regarding timing belt, well, there is no timing belt in our car, open the bornet and figure it yourself.
Since our engine battery is below our rear passenger seat, change it to bigger capicity...N60
sorry guys, was busy with my house renovation, don't have time to update my mod on open pod filter...
will update with pictures soon when I get all the materials ready and mod..

You sure can change the 12V battery? I heard the battery is custom made one with vent.
From prius chat, i found:
1. Needs to be sealed. There should be no way to spill any elecrolyte.
2. Needs to be vented if there are chances of dangerous gasses that will, or can be released.
3. Needs to be 12V. 13.8V to be exact. The DC-DC converter determines if it goes into charge mode (14V) based on sense voltage.
4. Needs to have 28AH capacity. Can be greater if space allows.
5. Needs to be able to tolerate large charge currents, at least for a short term. The OEM battery is said to take a 3A charge current, though it baffles me that the DC-DC converter outputs 80-100A with no current regulation to the OEM battery, other than the fuseable links' inherent resistances.
6. Needs to be able to provide 100-150A. Granted, it won't provide this for long with a 28AH battery.
6. Needs to fit or be retrofitted to the provided storage space in the underhatch.
7. Needs to have the right posts, or the wires altered to accomodate the new posts.
Read more:
http://priuschat.com/threads/replacement-o.../#ixzz2VS5AS3YbNormal 12V battery last 2-4 yrs while ours can last 5 years.