Hi all I am getting a bit bothered with the posts about PP9 batteries.
First the descriptions. M a capital means Mega or 1 million. m, little m means milli or 1 thousandth.
As quoted 8800Mah for a PP 9 battery is just not possible otherwise electric cars would have the battery in the glove box.
The PP9 battery is quite a small battery and to have these numbers printed on them is just not true. I looked some up on ebay and found some I might just believe at 1.2 Ahrs (or 1200mAhrs).
Even this I find difficult for the volume of the battery.
I was told from a GB supplier that in China you can get anything you like printed on any battery you want.
About 7 or 8 years ago I bought a couple of 3800mAhr NiMh batteries. They did not seem to last very long and a while later I bought a piece of electronics which measured the i/p and o/p watt capacity of the batteries. My so called 3800mAh batteries were just over 1500 mAh each.
With Nimh batteries as the capacity goes up so does the weight of the battery.
Common sense once triggered can tell you that the numbers in the posts on this forum for this very small battery make them difficult to accept.
Has anyone tried to use a PP9 battery as a drive battery? With the numbers quoted you should be able to run a small boat at full speed all afternoon. We know this is just not going to happen!
I am not saying that members reporting this are mistaken, it is that what is printed is just not true!
Phone your specialist supplier for batteries and have a chat with them. When I last looked on the Components Shop web site they had LiFe cells (3.6 volts per cell) at 2600mAh.
The volume of the battery looks higher than the volume of a PP9 and the chemicals inside do all the work.
LiFe cells at 3.6 volts are used in car batteries and many units of 50 volt blocks are used in parallel to get the capacity needed for the claimed mileage.
Lipos that modellers use are a different combination of chemicals have 3.7 volts at the terminals.
As an aside I have a 1 cell electric torch the Lipo inside says 3450 mAh capacity. I weighed it and it just can't be it is not heavy enough more like 1500mAh.
As I said they will print anything you want on a battery out of China. Reliable countries are Japan and a lot of the far east and Europe and USA.