Hello CC Bear

Siemens do not have an instruction manual on their website, which I can easily find

I never received an instruction manual, when I purchased my two sets of very expensive hearing aids

This eBay seller shows you how to cut the tube to correct length, and which way to adjust the trimmer
cw stands for turning the trimmer clockwise
ccw stands for turning the trimmer counter clockwise

From experience, from using cheaper hearing aids, the hearing aid will amplify ALL noise
Having the volume down as low as possible will decrease the background noise

Hope this info helps you out until someone with your brand of hearing aid, comes forward with their information

Hello CC Bear

The batteries you received would have normally been type 13 Alkaline (11.6 diameter 5.4 thick) 1.5 volt
You can expect them to last about two weeks duration

I use Zinc Air (type 675) batteries they are the same dimensions as the Alkaline type 13, but are only 1.45 volt
When the sticky tab is removed from the back of the battery, the air goes through some very small holes, and mixes with the zinc, to activate the battery
You can not stop the activation by replacing the sticky tab, Zinc Air usually last me about 3 weeks

I purchase mine from this Australian mob through eBay, this is their home website which is slightly cheaper than their eBay price
They sell all type and sizes of hearing aid batteries

Hope this helps you out

Hello CC Bear

The type AG13 Alkaline battery which is what the lower price hearing aid sellers normally give us(1.5 volt, 11.6 dia, 5.4 width) start off at 1.5 volt, but will quickly run down lower than that voltage, they have a capacity of about 200 mAh
Do not get confused with the ZA13 battery, which is a Zinc Air of (7.9 dia, 5.4 width), which will not fit

The type A675 Zinc Air battery (1.45 volt, 11.6 dia, 5.4 width) will stay longer at its voltage, as it has a capacity of around 600 mAh

In my opinion, for my type of hearing loss, the Zinc Air is better than the Alkaline, although it is as you say 0.05 lower voltage

As you are (like I was), beginning to experiment then perhaps you could buy one packet (6 batteries) of both AG13 Alkaline and A675 Zinc Air batteries, to find which is best for you

A very small expense as compared to the price of tailor made hearing aids

Note that expensive tailor made hearing aids come with Zinc Air, and not Alkaline batteries

Hope this info is helpful to you, and that you let us all know in the future, how it all went