The published weight is 1610 pounds. It is less the valances and drivetrain. Engine and transaxle weigh 400lb, so I calculate less than 1200 as it sits.
The question about the gas tank is because I'm also considering an install in the unmodified engine bay of a Type II.
With the Beetle, I'd like the primary battery pack to replace the rear seat, with a secondary pack in front replacing the gas tank sized for front/rear weight balance. And an option to plug-in an additional battery where the engine used to reside, or in a trailer, to extend the range. Minimum range would be a 3 mile track plus return road. There's always a wait in line between runs.
I'm assuming a DC-DC inversion, for instance a 1st/2nd gen Prius battery at 288 volts bumped to 650.
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That would be a 24.5 kw-h pack and weigh 633 lbs. 400 amps for 30 sec, 120 amps continuous.
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That would be ~200lb over the stock weight. That's acceptable. My Superbeetle weighs 2000 pounds.
But
EV-Power | CALB (40Ah-400Ah) shows $55-60 per, or $11,520 for 192 each. Is that right?
Edit: used+Prius+battery+pack into Google returns pricing in the range $1760-2628, with one site offering "...from $850". So that's my default choice. Dimensions are 15 x 40 x 9 in. I can't measure the back seat width right now but it's 42" at the rear window. So I could stack two or three there.
I found this on the 3rd gen Prius:
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The 2010 Prius has one nickel metal hydride main battery pack that weighs 110 pounds. The battery pack contains 168 individual 1.2 V cells wired in series with a nominal voltage of 201.6 V DC. The 2010 Prius PHV has three lithium-ion battery packs, one main and two additional packs (pack one and pack two) with a combined weight of 330 pounds. Each battery pack contains 96 individual 3.6 V cells wired in series with a nominal voltage of 345.6 V DC.
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http://www.toyota.com/esq/vehicles/plug-in-hybrid/toyotas-first-production-lithium-ion-drive-battery.html
Apparently Toyota use only 2 of the 3 packs at any one time, but they charge in series.
Wikipedia says:
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The cost of replacing the battery varies between US$2,200 and US$2,600 from a Toyota dealer, but low-use units from salvage yards are available for around US$500.[148] One study indicates it may be worthwhile to rebuild batteries using good blades from defective used batteries.
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What's a headway cell? There is an access plate at the front of the center tunnel that's about 1 1/2x3". If I could slide 6ft long sticks in there in pairs it might hold six.That would be 92 cells right below center of gravity. That might present cooling problems though.