Gigaset Phone Base Flashing
Manda Ulibarri
Usually this happens when you first set up your Gigaset Dect phone and Base Station. Normally after a minute or so the handset will register with the Base Station meaning the phone handset is ready to start using.
7. Within 60 seconds of doing this press and hold the blue button on the front of the base station for about 3 seconds - as shown below there will be a blue light on the front of the base station:
All you need to do is to re-boot the Base Station and this will re-register the handset. To do this just unplug the Base Station from the router for about 5 minutes then plug back in and the phone should reset itself.
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
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!
Same things happend to my pair of Gigaset AS28H and I suspect it is some kind of planned obsolescence feature planted into the hardware. It seems like when the battery voltage drops to little less than 2.4v it shuts off. Given that the regular rechargeable batteries are rated at 1.2v this is pretty close.
Had the same experience, ordered Gigaset certified reloadable batteries at Gigaset support. They work fine for 3 weeks now. The Duracell rechargeable batteries I used before were not certified for use in the handset.. At a low tension (1,20v per battery) they do not deliver sufficient current for the handset and it seems the low battery circuit detect this low current and shuts down the unit. The certified batteries do deliver still sufficient current at low voltage. But I still have to see if my conclusions stay correct after several months of usage
The telephone assumes that the batteries are UNCHARGED when first inserted, and proceeds to charge them at maximum voltage for 8.5 hours before switching to trickle (low) charging. When the telephone is removed from the charger base, it measures the discharge current, to try to learn how long to charge when the telephone is connected again.
The problem occurs when fully charged batteries are inserted. The telephone tries to charge them at maximum voltage, which ultimately degrades/destroys them. Unfortunately new NiMH batteries are usually pre-charged, so are usually damaged by overcharging.
So if new charged batteries are used, they should be allowed to fully discharge before the phone is placed on its charger base. Then after charging, without removing the batteries, the phone should be allowed to fully discharge before it is again placed on its charger. After that, the phone can be left on the charger because it has learned the capacity of the battery, and only trickle charges it.
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.
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 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.
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.
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 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.
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.
High quality rechargeable batteries have a very low self discharge (LSD). If you leave them unused on the shelf , they will hardly loose their capacity after a year, while batteries of less quality will have lost their capacity almost entirely.
I bought eneloop batteries last April. I hardly use the phone - maybe three times a week. Rest of the time its on the charging cradle. Today took phone off cradle showing full charge and within 20secs had gone off. So Eneloop not the answer,
I have been using the Gigaset selected batteries for 10 months without any problem anymore.... but now I have the problem again after charging the phone in the master unit. Further testing revealed that the batteries in the master unit get extremely hot. Then after some time they start loosing the capacity, although in an external microcontrolled charger they are "fully charged". The handset in the slave charger units do not have the problem. I dit some further testing, including with new batteries and it seems that the master unit charger does destroy the new batteries. So if you have problems with batteries : lost capacity and hot in the cradle, it means the charger is not working correctly and even will destroy the batteries. My solution I use only the slave units for charging, no problems for 3 months anymore.
However I am now suspecting the battery chargers. I have a mix of the originally supplied batteries, eneloops as well others. They all fail in the phones after a few months of use. I also have a state of the art battery panasonic battery charger and have always been confused when I insert perfectly charged batteries into the phones which the phone then reports as half charged. I do not feel that is right.
Thanks. But I suspect these are not simple chargers, NiMh do not like simple chargers. I have opened a support case with Gigaset complaining about my three chargers. They confirmed they should be 4V. As stated above I also measured the voltage with a 100Ω 50mA load and recently measured 6.8V. I believe the problem, in most of the above cases, to be overcharged batteries due to too high a charging voltage.
Do you have a practical conclusion. I.e. will the firm replace the holders? They never worked and I tried several batteries from Varta to Ikea Ladda. Sometimes worked for a rather short time, but suddenly not anymore.
Proper battery charging usually function as current source - they supply a constant current within a pre-defined voltage range. They should cut off once the target voltage was reached and then switch to trickle charge based on voltage drop.
The new charger arrived courtesy of siemens support. Its voltage was effectively identical to my own three chargers. So my assumptions in the previous post are either totally wrong or this new changer is also duff. I cut one of the gigaset charging leads to allow use of two multi-meters and tested two phones. The charger measured 7.534v on no load, ie. nothing in the cradle. I got to work with two DVMs and started monitoring the current and voltage going to the cradle, in the end I also used a scope.
The batteries are eneloop 1.2v 750mAh so C/10 should be 75mA. These eneloops are equivilent to those recommended by gmkbatteries.co.uk for a C430HX, and from what I can tell the original gigaset batteries were 700mAh. So charging these at 170mA, is about C/4.4. I then looked at the first C430HX phone again. After it settled down I saw it also oscillating between the same two values. Using a scope, rather than DVMs, I was able to see a 600ms pulse charging with the battery getting a C/4.4 shot of current for 100ms of the cycle. I am not a battery expert so I cant comment on the effects of C/4.4 pulse charging fully charged batteries for months or years.
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