I ordered from merchants Amazon 2x Philips 9V lithium sales designation "Philips 6FR61LB1A / 10 Battery Lithium Ultra (9V, 1-er Blister)".
Was not supplied in a blister but in normal commercial sales packaging.
It is a completely black block (only contacts Silver) is foiled with Philips.
There are neither on the battery nor on the packaging a production date.
Best before 12/2019 is even back on the packaging.
Out of the box Both blocks have a voltage of 9,83V.
Fit the blocks of size have properly in the smoke detector.
Philips writes back only "Lasts 4x longer than standard alkaline".
The photo here on Amazon corresponds to what has been delivered.
I ordered from merchants Amazon 2x sales designation "Varta Professional Lithium 9V battery".
On the packaging back and under the 9V is "6122".
It is a black block. Only ground and contacts are silver.
There are neither on the battery nor on the packaging a production date.
Best before 12/2029 is the bottom of the silver block floor.
Immediately after unpacking a block had a voltage of 9,45V and 9,43V one.
Fit the blocks of size have properly in the smoke detector.
The photo here on Amazon does not correspond to what is delivered. Colors, designs and specifications are different.
Back on the package there is the inscription "* 10 years minimum durability", which I have never found a * to the auxiliary.
I find it interesting the long term on the back of the packaging "9V E block 6122 transistor Lithium". The transistor.
I have measured the voltages with a Fluke 87V.
So far there are no malfunctions with me through the higher voltage by lithium.
Where a normal new Alkaline at 9,75V (Duracell Plus Power), and thus the Varta is even significantly below!
Also interesting: My smoke alarm should the voltage threshold for the beeping empty for the low battery warning approximately 9,08V and 9,13V have between. The former value he has beeped. If not second value yet.
Hope this information help others.
