I have exactly the same problems now with al gigasets S79H sets. It started with one but now all three have the same problem. I noticed that with new rechargeable batteries, they function OK, till after some time the problem repeats itself. I also have a different gigaset S68H and that one functions well but it has a different charging holder with similar adapter , thus I never tried to put the S79H sets in that charger holder because they do not fit. Now I noticed that all S79H chargers deliver without load a very high voltage and also the batteries are overcharged to a rather large voltage ( for both in series 2,95 volt which is excessive). Apparently the gigaset unit then decides to switch itself off to protect the telephone. My conclusion is that all 79H charging adapters have gone faulty after so many years and deliver a much too high charging voltage which causes the units to switch off to protect themselves. When new batteries are installed or batteries charged with an external general purpose charger the voltage per battery is much lower and the gigasets function normal till they are put in the chargers again. The adapter of that unit S68H which works OK , delivers indeed a much lower voltage without load . 5.73 volt versus 7.5 to 8 volts of the S79H adapters while the adapters are interchangeable . I am pretty sure that that is the problem because I have taken the S68H adapter out of the S68H charge holder and have put it in the S79H charger holder and now charging the S79H does not cause a switch off.
I have already ordered three new adapters.
In retrospect the problem with the non-lasting batteries in my gigaset dect sets, is that I used batteries which were not of the right quality. I am now using high quality eneloop batteries and I have no problems anymore. And strange enough also the Ikea laddo batteries also seem to work. They are apparently made by the same Japanese factory.
Dect batteries
Dect telephones like the gigaset telephones require low self discharge NiMH AAA batteries, because they do not seem to wear out by the continuously charge when they are placed in the charger like the cheaper brands.
Since I use these low self discharge batteries I do not have the problems discussed here. ( Showing battery empty sign and switching off after a short while)
Eneloop batteries ( original made by Sanyo but now Panasonic) are made in Japan.
Several other makes are made by the same the factory ( like the Ikea brand Ladda and also Fujitsu) and are obtainable for a lower price. Also the Amazonbasics batteries exhibit a very low self discharge (after 24 month still 80% charge). If you check the rechargeable Battery brands advised by Gigaset or other Dect telephone manufacturers one wil find that they all have low self discharge specifications.
Eneloop is a brand of 1.2-volt low self-discharge nickel–metal hydride (NiMH) rechargeable batteries and accessories developed by Sanyo (later acquired by Panasonic), introduced in 2005.
Eneloop cells lose their charge much more slowly than the 0.5–4% per day loss by older-technology NiMH batteries, retaining about 85% of their charge for a year after charging.This allows them to be sold precharged and ready for use, unlike older types.
Because they can replace a large number of alkaline batteries over their life cycle, they are marketed as being eco-friendly.
Sanyo was acquired by Panasonic in 2009. In exchange for the US FTC's approval of the takeover, Panasonic agreed to sell Sanyo's portable NiMH battery business to Fujitsu subsidiary FDK in order to preserve competition,and later did so.
Following this, Panasonic retained the "Eneloop" trademark, but continued to source the batteries themselves from the same former-Sanyo factories (now owned by FDK).
Following the acquisition of Sanyo by Panasonic, a fourth generation was introduced in April 2013. The number of charges per cell was increased from 1800 to 2100 cycles for both AA (BK-3MCC) and AAA (BK-4MCC) models. In some countries the batteries are branded as Panasonic.
The eneloop type quality batteries with the extremely low self discharge do not seem to wear out when continuously charged like other brands and retain their quality for a much longer time.
Of course there are more mostly Japanese brands which exhibit more or less the same low self discharge properties which are also suitable for dect telephones. Do not select the types with more than 900 mA capacity. The lower capacity ones last longer and can have more recharge cycles.
16 Comments
Hi
I have the same problem, shut down during a call or during the dial process with a C530A duo.
Both handsets worked well for 3,5 years, now both give the problem.
I put in new batteries in both handsets, seemed to work ok, but now I have the same problems.
The battery indicator sometimes shows red, when testing the batteries out of the handset it shows they are full.
After putting the batteries back in the handset works for some time.
Any new ideas?
by Robert Vanhalme
I have similar probs with gigaset C300. Can anyone tell me if you should leave handset in cradle in between calls or wait until it runs down before re-charging? I suspect if the batteries are constantly on charge it wears them out faster anyway
by Clifford Thomas
My conclusion after almost a year of testing on 4 Gigaset phones: not all rechargeable batteries are the same!! realy!! So only use the batteries that are certified in the Gigaset list or just order at Gigaset, no problems anymore!
by Robert Vanhalme
My 3 phones are flashing 'no base' what does this mean
by Sandra Light
@Sandra Light
Does that base station have power connected to it?
Does it indicate that it is on?
by jayeff
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