Answers.Body: <p>The charging circuit is in the battery, so any 10V, 700mA DC power supply should work. The circuit driven by a <a href="https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP26123/document_id/1398" rel="nofollow noreferrer">MP26123</a> chip.</p>
  <p>The battery schematic is available from the <em>EV3 Hardware Developer Kit</em> on the <a href="https://www.lego.com/en-us/themes/mindstorms/downloads" rel="nofollow noreferrer">MINDSTORMS download page</a> for anyone who wants to confirm this.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-12-13T20:17:32.460Z
Answers.Text: Thanks a lot David for your very completed answer.
Answers.UserDisplayName: Jean
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-12-13T21:13:06.040Z
Answers.Text: Don't forget to mark this as the correct answer if you find this helpful (it helps other people find the answer too).
Answers.UserDisplayName: David Lechner
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-12-13T16:05:50.817Z
Answers.LastActivityDate: 2021-12-13T16:05:50.817Z
Answers.UserDisplayName: David Lechner
Body: <p>I would like to build a charging station for EV3 with rechargeable battery (45501).</p>
  <p>Does the transformer (45517) give a simple stable dc voltage (power supply)? Or does it provide a controlled voltage / current depending on the charge with charging a method (CC-CV or other)? What is the charging method?</p>
  <p>In other words: the charging intelligence is in the rechargeable battery or in the transformer?</p>
  
Tags: <ev3><mindstorms><electronics><battery>
Title: Transformer 45517: power supply or charger?
UserDisplayName: Jean
ThreadText: # Transformer 45517: power supply or charger?
  
  (Asked by: username_0 on 2021-12-13)
  
  I would like to build a charging station for EV3 with rechargeable battery (45501).
  
  Does the transformer (45517) give a simple stable dc voltage (power supply)? Or does it provide a controlled voltage / current depending on the charge with charging a method (CC-CV or other)? What is the charging method?
  
  In other words: the charging intelligence is in the rechargeable battery or in the transformer?
  
  **Tags:** ev3, mindstorms, electronics, battery
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2021-12-13. Score: 4
  
  The charging circuit is in the battery, so any 10V, 700mA DC power supply should work. The circuit driven by a [MP26123](https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP26123/document_id/1398) chip.
  
  The battery schematic is available from the *EV3 Hardware Developer Kit* on the [MINDSTORMS download page](https://www.lego.com/en-us/themes/mindstorms/downloads) for anyone who wants to confirm this.
  
  > **Comments:**
  > **username_0**: Thanks a lot David for your very completed answer.  
  > **username_1**: Don't forget to mark this as the correct answer if you find this helpful (it helps other people find the answer too).  
  
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