Modifying Power Source: Hook Up to Wall & Recharge

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Discussion Overview

The discussion revolves around modifying a small electronic toy that operates on AAA batteries to use a rechargeable battery connected to a wall outlet. Participants explore the feasibility of using lithium batteries and the necessary components for recharging.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses interest in measuring the current supplied by AAA batteries and connecting a rechargeable battery to the wall for convenience.
  • Another participant suggests purchasing rechargeable AAA batteries and a compatible charger as a simpler solution.
  • A participant emphasizes the desire to engage in the project for educational purposes and future applications, rather than just for convenience.
  • Concerns are raised about the safety of building a custom lithium-ion battery charger due to the risks of under- and over-charging, with a recommendation to purchase pre-made battery packs and chargers instead.

Areas of Agreement / Disagreement

Participants present differing views on the approach to modifying the toy, with some advocating for simpler solutions and others favoring a more complex, hands-on project. Safety concerns regarding lithium-ion batteries and their chargers are also highlighted, indicating a lack of consensus on the best method to proceed.

Contextual Notes

Participants do not fully agree on the best approach to modifying the toy, and there are unresolved concerns regarding the safety and feasibility of using lithium-ion batteries without proper charging equipment.

Who May Find This Useful

Individuals interested in electronics, DIY projects, battery technology, and safety considerations in battery modifications may find this discussion relevant.

iggybaseball
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I have a small electronic toy that takes 4 regular triple a batteries. I would like to open it up and see how much current the batteries are supplying, and then I would like to hook up a battery that I don't have to throw away. I would like to hook up the device to the wall to recharge it. I think that a lithium battery would work, but what device would i buy so that the battery would recharge from the wall? thanks
 
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Why don't you just buy some rechargeable AAA batteries, and a recharger that fits them? You can buy such things at almost any store, including Wal-Mart and Sears and so on.

- Warren
 
While this is certainly true (and certainly easier), I want to do it for the tinker factor and the knowledge. I would like to use this in a more complicated project later. Thanks a lot.
 
You cannot (and should not) build your own lithium-ion battery charger. Lithium-ion batteries are very sensitive to both under- and over-charge situations, and will readily explode if not charged (or discharged) properly. It is a testament to modern electrical engineering that something so potentially dangerous can be so well controlled.

As far as Ni-Cad and other rechargeable chemistries, you can buy battery packs and chargers from any of a million places on the web. I suggest http://www.batteryspace.com

- Warren
 

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