Originally posted by Larrymc Buy yourself a Wasabi dual charger and two battery pack
amazon.com : Wasabi Power Battery (2-Pack) and Dual USB Charger for Pentax D-LI90 and Pentax 645D, 645Z, K-01, K-1, K-1 II, K-3, K-3 Mark III, K-5, K-5 II, K-5 IIs, K-7 : Camera & Photo?tag=pentaxforums-20& I've used Wasabi since 2014 with no trouble they may have little shorter charge life but they work perfectly well plus you have a charger that regulates the charge and can be used with the supplied with the USB cord. You can't go wrong for 26 bucks.
This charger is as much critical as
THIS ONE
Both charge fast and have just the 2 contacts. The Wasabi is made in China and known under many other names such as Newmowa.
I have come across aftermarket types of the D-LI109 which started to swell! Of course quickcharge warms up the battery considerably more.
So the combination of a cheap interior (which they have!), quick charging and lack of temperature sensor should indicate a No-Go to anybody who wants to take care of his Pentax!
Actually the clone-manufacturers cheat with their clones:
The original Pentax D-LI90 (as does the D-LI109!) has a 10kOhm@20°C NTC temperature sensor.
The clones use a simple 10kOhm resistor to cheat the original Pentax charger which would otherwise not charge it!
All clone-chargers no matter which one lack the (obligatory) 3-rd contact for temperature control!
They use the obligatory centertap for voltage-monitoring and have the obligatory surge-protection.
Thats the cheap way and in the clones surge-protection is done usually just with an 8-leg double MOSFET which shuts off PLUS in case of a too high surge.
Hardly any of the clones use a polyswitch (resettable fuse, i.e. a polymeric positive temperature coefficient device = PPTC)
which anyway is quite slow in reaction but at least better than nothing.
All this cheap stuff you won't find in Pentax originals because of their much more advanced temperature NTC sensor.
Last edited by photogem; 06-25-2021 at 02:38 AM.