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lead acid

  1. Lithium Ion replacement for Lead Acid?

    Batteries and Charging
    My VW Bug has 10 lead acid batteries that need replacing. Is there a lithium ion battery that would be a drop-in replacement, i.e., it would have the same shape and be 12 volts? Or could I somehow buy or scavenge lithium ion cells and assemble them to make a 120 volt battery to take the place...
  2. Semi-OT: Deep-cycle Lead Acid UPS Batteries for home power

    Batteries and Charging
    Hello all. I work in a data center, and we recently replaced our UPS systems. As part of this project, I was given the opportunity to take the old UPS/ATS system home. Unfortunately, the system was a 3-phase 480 volt system and there was no means of connecting it to my 220v home power. I did...
  3. Difference between a cheaper and more expensive battery

    Batteries and Charging
    So this is not a car but it is the same concept. I am working on a solar powered boat for a competition and am looking at batteries. We are limited to 100 lbs of lead acid batteries so i am trying to get the most power for the weight. I was wondering what the difference between a cheap battery...
  4. Rejuvenation of Lead acid batteries, Ni-MH batteries, and Ni-Cd batteries

    :)There is a new battery technology. Lead acid batteries can now be used for a more indefinite period of time. It would not be surprising if people use the same lead acid batteries for up to 45 years. The best batteries for this new battery technology are flooded lead acid batteries...
  5. 12V SLA/FLA BMS/Charger Design

    Batteries and Charging
    As I am planning to go ahead with my electric tractor conversion, and will use 12V SLAs (for low cost, where more weight is good, and usage will be only occasional). So I want to make a fairly simple but effective charging system and BMS for a string of 4 to 24 SLA batteries or even a single...
  6. Peukert effect during charge as well as discharge

    Batteries and Charging
    Generally the Peukert effect is considered during discharge of lead-acid batteries, but for charging there is a similar effect. I found a detailed explanation of this phenomenon here: and in more detail...
  7. Lead's not dead: Design News article

    EV News
    I just found this article from Design News about an improvement in Lead-Acid cells for a much higher power density (not energy density), and longer life, at lower cost: There was also a recent article about Li-Ion cells used in...
  8. Fiero 6V Lead Acid Battery Racks

    I have a set of Battery Racks for a 1985 Fiero that hold 20, 6 Volt lead acid batteries and could be bolted into the car without any welding. Just drill holes and bolt them in.
  9. Lead acid voltage sag under load: how much abuse can they take?

    Batteries and Charging
    From all my searching around I have been given a figure of 1.75V/cell as the lowest you can safely go with lead acid, but I am not sure what this means. Does this mean resting voltage, like when I let off the throttle, or does it mean voltage under load? My pack is 72 volts worth of used...
  10. Jd"s red neck truck

    All EV Conversions and Builds
    Announcing the one month birthday of SHAZAM! my electric truck. One month ago with much effort and few fla batteries he hopped of of the ramps and tasted pavement as an ev. Made the first few laps around the neighborhood, and carried his first k9 and human passengers. After a month of very...
  11. Lead Acid Battery Purchase

    Parts Vendors
    Hey Guys, This is my first post on this website so I'll give a little background info of the project I'm planning on doing. Myself and a couple other guys are doing our Senior Design Project on an EV Conversion of an old VW Beetle. We are doing this on a low budget so our battery chemistry...
  12. Mythbusters: Does Lead Weight = Energy Capacity?

    Batteries and Charging
    So, I was recently told that the weight of a lead battery determines how much energy it can store. I'm starting to think that they just meant that as an approximation because I always thought design could have an effect as well. Lead-Acid has become better from 50 years ago right? Also, if...
  13. Lead Acid BMS

    Batteries and Charging
    Hello all, Lately I have been doing some research into EV BMS systems, specifically for my lead acid pack based on 6v flooded batts. There are a few homebrew one-off fixed voltage designs, a few voltage balancing units, but nothing that I would really call a 'management system'. There is lots...
  14. Where to find batteries?

    All EV Conversions and Builds
    I'm going to build an electric bike out of an old gs500 but im on a tight budget and having a hard time finding batteries for it. I'm thinking 48volts so I need four and since they need to be cheap i want flooded lead - acid. Any ideas?
  15. How often do flooded batteries require water?

    All EV Conversions and Builds
    I'm trying to decide between Optima Yellow-Tops and regular flooded lead-acid batteries. One of the major concerns is that I think space will be a little tight, and batteries will be stacked one on top of the other. This will make it difficult to access the reservoirs on the lead-acid...