Battery change
Ex works, the Dect 302 already comes to the customer with three pre-installed AA batteries. Even if the parts are now selling like hotcakes, you should still carry out a visual inspection before assembly. The Dect 302 has a cover on the side facing the display, which can be slid to the left (in the photo).
Then, with a little care, it can also be easily lifted up and unhooked. We see the three batteries and their installation direction. Whether the Dect 302 has a reverse polarity protection, I could not find out so far, because AVM has not answered my last mail. However, to be on the safe side, I would always advise really concentrating and using the batteries exactly as directed. Then nothing will happen either.
The eternal question about the battery
AVM strongly advises against replacing the batteries with AA rechargeables, and there is a perfectly plausible reason for that. For reasons of sustainability, one could of course argue in favor of rechargeable batteries, but this would be a tight squeeze in terms of operational reliability at the latest. The tiresome keyword is self-discharge, which in the case of so-called primary cells (i.e. alkaline batteries) is between 3 and 6% per year at approx. 20 °C, while even good rechargeable batteries lose 4 to 5% per month (!). In addition, the voltage of the AA batteries with a maximum of 1.2 volts is already significantly lower than the nominal 1.5 volts of the batteries.
The voltage curves at different discharges also deviate considerably from each other, so that an accurate prediction of the charging capacity over a longer period of time also becomes difficult or impossible. AVM strongly advises against this, and the Dect 302 also throws an error message, because the voltage is much too low, even with a battery that has just been charged. From my own experience, I can really advise against it, especially since a 40 pack of alkaline AA batteries from Varta (Industrial) or comparable brands only costs between 10 and 15 euros. The old batteries can be disposed of in the recycling box at a suitable market, thus closing the raw material cycle again.
I work with different Eneloops (Normal and Pro) in the video and photo studio and can hardly leave them longer than 4 to 5 months in unused devices without complications or very short remaining life. The ecological idea may be all well and good, but the technical aspect weighs heavier here. You should use really good (!) alkaline batteries (check the expiration date!), then they will last for more than a single heating period. This then also distinguishes the Dect 302 (besides the external shape) from the Dect 301, which only relies on two AA batteries. You have to see how you get through the fall, winter and spring.
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