dhanny Posted November 10, 2015 Report Share Posted November 10, 2015 Need help, the other day my battery (P 108) stopped working, I've disarmed and found a diode that had exploded. Replace it and returned to work. But when I saw the voltage on the tester had 20.2v between negative and positive (as seen in the photos) and 20.2v between the center and positive. I have taken the voltage in P107 and values are 8.2V. P108 battery has someone? and you tell me that voltage is between positive and negative please. Diode Exploted Battery P108 i have a Dude With Voltage, I have no other to check Battery P107 I have 3 more, all have the same voltage 8.2 Quote Link to comment Share on other sites More sharing options...
jeffmcmillan Posted November 10, 2015 Report Share Posted November 10, 2015 An 18V battery has 5 (or 5 pairs) of lithium ion cells in series with nominal 3.6V each adding up to 18V. The voltage without load, however, can be higher such as 4V which can result in the battery appearing to be charged to 20V or more. This is why Dewalt markets their newer 18V tools at 20V tools. Quote Link to comment Share on other sites More sharing options...
dhanny Posted November 10, 2015 Author Report Share Posted November 10, 2015 I understand, I just want to know whether it is right to have 8.2V in P107 and 20v in P108 Battery Quote Link to comment Share on other sites More sharing options...
jeffmcmillan Posted November 10, 2015 Report Share Posted November 10, 2015 Whoops, I misunderstood which pictures were which batteries. What is the P107 voltage between negative and positive? The center is probably a control voltage that would likely vary between different model batteries so the charger can distinguish between them. Unfortunately I don't actually own any newer Ryobi tools so I can't tell you what the voltage should be. Quote Link to comment Share on other sites More sharing options...
dhanny Posted November 10, 2015 Author Report Share Posted November 10, 2015 Whoops, I misunderstood which pictures were which batteries. What is the P107 voltage between negative and positive? The center is probably a control voltage that would likely vary between different model batteries so the charger can distinguish between them. Unfortunately I don't actually own any newer Ryobi tools so I can't tell you what the voltage should be. For the P107 (1.5 Ah) have 8.2v between negative and Positive but in the other model P108 (4Ah) have 20v, i need know if is normal the difference between both models of batteries. Quote Link to comment Share on other sites More sharing options...
jeffmcmillan Posted November 10, 2015 Report Share Posted November 10, 2015 That is very strange. I wouldn't expect the P107 to power your tools with only 8.2V. Usually anything under 15V won't take a charge or power tools well. Quote Link to comment Share on other sites More sharing options...
dhanny Posted November 11, 2015 Author Report Share Posted November 11, 2015 Yes, is very strange, now only need that other user with Ryobi P108 Battery Show me the values between - and + Pleaseeee Quote Link to comment Share on other sites More sharing options...
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