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11-01-2015, 06:00 AM   #1
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What're these battery terminals?

I've got a Pentax D-LI109 as well as Wasabi equivalents. Question is about the terminals. There are four on the factory battery, labeled "D", "-", "T", and "+", and the Pentax battery charger has four connectors to contact those terminals, similarly labeled. The Wasabi battery has the same four terminals, but only two connectors, plus and minus.

Questions: what do the "D" and "T" terminals represent in terms of functionality, is the Wasabi charger adequate (i.e., can the "D" and "T" terminals be ignored for charging purposes), and do the Wasabi batteries' "D" and "T" terminals actually do anything or are the connectors there just for "compatibility"?

11-01-2015, 06:38 AM   #2
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Mthese terminals are used to propyl monitor state of charge and control charging
11-01-2015, 11:45 AM   #3
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In some power tool batteries, an extra terminal tells the charger when the temperature of the cells starts to increase when they are fully charged.
11-02-2015, 09:53 AM   #4
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It means don't charge your Pentax batteries in the Wasabi charger. The batteries are built to different standards. While they both provide adequate voltage to power the camera, they likely aren't the same internally. Most chargers aren't smart enough to work well with a battery they weren't designed for.

11-02-2015, 02:22 PM   #5
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The 4th terminal may be related to a regulatory rlectrical requirement- see here for a thread about this on k3 li90 batteries: https://www.pentaxforums.com/forums/16-pentax-news-rumors/190153-new-battery-...li90p-why.html
11-02-2015, 06:04 PM   #6
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QuoteOriginally posted by AquaDome Quote
It means don't charge your Pentax batteries in the Wasabi charger. The batteries are built to different standards. While they both provide adequate voltage to power the camera, they likely aren't the same internally. Most chargers aren't smart enough to work well with a battery they weren't designed for.
Looks like very good advice, but I'd still like to know what the heck they are. Maybe I'll get one of my Japanese friends to look at the website and either figure it out or ask people at Ricoh about it.

---------- Post added 2015-11-02 at 08:22 PM ----------

found what looks like the answer thanks to Stevebrot, page two of this thread:

https://www.pentaxforums.com/forums/6-pentax-dslr-discussion/307009-pentax-batteries.html
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