Default power
The standard means of powering VP2 transmitters is via the familiar combination of a CR123 3v lithium battery supplemented by power from a supercapacitor charged by a small solar panel on the face of the transmitter, as described elsewhere. There are actually several minor variations on naming of the CR123 batteries such as CR123A, but in practice these are all identical in operation and so any of these can be used. Note however that the battery should be a standard primary (non-rechargeable) lithium cell. There is no advantage at all to using a rechargeable CR123 type and in fact Davis specifically warn against using the rechargeable type – the SIM board circuitry cannot recharge the battery and the capacity of the rechargeable type is lower and with different discharge characteristics.
In a few cases, such as the cabled VP2 ISS transmitter and the 6331 transmitter there is no solar panel, supercap or battery holder and the SIM board is typically powered from an AC mains adapter. While the wireless SIM boards are typically powered at 3v from the CR123 battery, the circuitry is actually tolerant to 5v (but no higher) and so the same 6625 5v mains adapter can be used as powers the VP2 consoles.
Alternative power options
Actually, all VP2 transmitter boards are fitted with a socket to accept the 5v jack from the 6625 mains adapter.
To be completed.
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