The battery meter on a Shocker RSX is not like the battery meter on a cell phone. Since every single 9 volt battery is different it there is no way that the board can “guess” at what levels the battery started, or what % of use the battery has remaining at any given moment. There for the meter cannot show exactly the % for the individual battery you have chosen to use – at least not as accurately as a cell phone using a fixed battery type and construction.
Instead the board compares the voltage and amperage of the battery you have chosen with a pre-determined standard and displays that information. Since most alkaline 9 volts drop their initial voltage/amperage from a higher level to a “working level” very quickly – its not uncommon to loose a bar or two after the first use and then have it hold that level for an extended period.
Additionally – every 9 volt battery is made up of individual cells internally – wired in series. This is why using a high quality 9 volt battery is important, lower quality batteries will have lower quality internal connections and therefore less usable life in a high draw application like that of a direct acting solenoid (as used in the Shocker RSX).
This is somewhat mitigated by the use of a capacitor (large black can shaped component on the control board). This draws a small amount of power from the 9 volt so that the board always has some quick acting energy and greatly reduces the demand on the battery itself. With the draw back being; low quality batteries will break down faster under this constant low-amperage draw. If you choose to use cheaper batteries – plan to remove them during storage (anything more than a day) to prevent this effect.
Possible Cause: Rechargeable batteries will likely not show fully charged in the OLED display. This is because they operate at lower amperage than Alkaline batteries. This will not harm the performance of the Shocker RSX.
Possible Cause: A worn or low quality battery is being used.
Solution: Replace the battery with a quality brand 9 Volt Alkaline battery. Do not re-use batteries from other devises in the Shocker RSX.
Possible Cause: The battery has an internal issue limiting its voltage output.
Solution: Replace the battery with an alternative 9 volt Alkaline battery. It is important to note that batteries can be dead or damaged directly from the manufactures packaging.