Joined in 2023 
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No, it is not necessary to fully discharge these batteries before recharging as they do not suffer from so called memory effect. Two Panasonic Eneloop AA 1900 mAh NiMH rechargeable batteries (we do not recommend using any other type of rechargeable batteries).
Panasonic eneloop, Ready to Use Ni-MH Battery AA Pack of 8
Have you compared the technical specs of the two battery models? That should give you an indication of the physical characteristics The Panasonic Eneloop AA batteries are the latest multi-purpose batteries by Panasonic (formerly Sanyo Eneloop) providing long-life, pre-charged, energy and money saving, eco-friendly rechargeable batteries. Recycle responsibly, a wide range of schemes are available. Most batteries rechargeable or non-rechargeable can be recycled. So in essence seems to me there are 3 design issues with the radiator thermostat in connection with battery use that I have discovered. Pretty major I think and im mulling getting rid of them
LED Torches & Flashlights
They're on the charger now, so far too early to comment on performance in the long term, but I tried two pairs in one of my Tado SRTs and the fit was easy peasy. Also, no problem to operate the SRT with the "ready to use" charge they came with. Also, thinking this hypothesis out loud - What if VERY cheap non-standard battery types tend to heat up (event) at mechanically idle current and thus cause reading error? (I don't think anybody will do that though :) ) Designed to be used for the regular battery consumers and professionals the Panasonic Eneloop rechargeable batteries are the perfect choice for powering medium to high current consuming devices such as Digital Cameras, torches, game controllers, radio-controlled toys and a range of household devices.
Panasonic Eneloop AA 1900 mAh NiMH or Pro 2500mAh Panasonic Eneloop AA 1900 mAh NiMH or Pro 2500mAh
apparently the specific type of battery. eg Panasonic eneloop 1900mAh is important. Perhaps tado help are confusing the issue, and it's really about SIZE not TYPE, and its other issues that are causing battery failure. Perhaps it's both. But they need to be clear. Shipped pre-charged, ready to use, these Panasonic Eneloop Rechargeable AA batteries are ideal for customers looking for a reusable battery with a long lifespan. According to the Technical Specifications (link below) of the Eneloop batteries the standard AA ones have a slightly smaller (14.35mm) diameter than the Pro ones (14.5mm). Although most widely known for its cell phones and other household electronics, Sanyo has helped pioneer many technological advances in the battery industry. Their Eneloop line of batteries was created to provide consumers with a series of rechargeable batteries with an extremely low self-discharge rate.https://community.tado.com/en-gb/discussion/3099/released-rechargeable-batteries-in-smart-radiator-thermostats-va02-hardware-revision
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