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Old 03-12-2015, 03:19 PM   #5 (permalink)
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Planetaire - '07 Toyota Prius 2 plug in
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Originally Posted by redpoint5 View Post
...Now I'm looking at replacement options, and I'm pretty sure I want to go with a modular design, such as prismatic cells, so that I can replace weak cells. I'd be interested in anything from 4Ah to about 20Ah....[/URL].
Between 4 and 20Ah ?. May I suggest 19.6 Ah

I use 4xA123 19.6Ah in my Prius 2 since one year with a capacitive bms.
Still ok. But I avoid using this 13.2 volts without the prius dc-dc converter on.
This battery is 8kg "ligther" and can be charged by the prius dc-dc-converter down to -10C -15C and up to 40-50C. Just after power on you can have 30A falling to 20A quickly.

On the prius gen 2 the max voltage is 14.1 volts. So 3,52v for each cell when well balanced.

In the prius there is no 12v battery low voltage cut off.
All what is connected via a relay will have a 9-10v protection.
I replaced all the w5w bulbs with led, say 4v protection.

Are you sure your 4 cells had the same capacity ?

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