I have an electrical bicycle that I rarely use, and I'm thinking about turning it into a project.

The electrical bicycle has a 36V Lithium-Ion battery. When it's fully charged, it produces around 42V (36V is measured when it's fully discharged). It's completely okay, but I want to test out something different.

I figured out that for the price of a new 15Ah 36V Lithium-Ion battery I can get 3 12V 41Ah (99RC) lead-acid batteries. If put in series, it'll produce 36V for 41Ah. That's more than twice the energy for the same price!

Except for the lead acid batteries having a slightly lower voltage (36V < 42V) than the Lithium-Ion counterparts, shorted lifetime and disregarding weight and size, what major disadvantages will the lead-acid batteries have?

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    \$\begingroup\$ Weight and size are major disadvantages. How can you disregard them? \$\endgroup\$ – Eugene Sh. Sep 26 '16 at 19:37
  • \$\begingroup\$ acid spills on crash? shorted plates and H2 ignition risk? \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Sep 26 '16 at 19:40
  • \$\begingroup\$ @EugeneSh. Because I know these are the reasons they are not used in commercial vehicles. I'm not planning on using this as a daily driver, but as maybe a way to increase power on the motor? \$\endgroup\$ – Mark Segal Sep 26 '16 at 19:42
  • \$\begingroup\$ You want to increase power on the motor by reducing the average voltage? Novel approach. \$\endgroup\$ – Asmyldof Sep 26 '16 at 19:49
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    \$\begingroup\$ A "12V" battery sits about 13-14V fully charged so the max voltage isn't so very different. \$\endgroup\$ – Brian Drummond Sep 26 '16 at 19:52

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