17.2 volt battery?

[ChristopherBuck]

I hope this has not already been posted and that I missed it, but I just checked the KOP checklist because our team needed to order more batteries for the competition season and saw that the KOP checklist specified the batteries as "17.2 Volts". I just want to be sure that this is a mistake?


Also, they list the part number as NP18-12, but the battery that we received specifies that its part number is NP18-12B. Am I right to assume that NP18-12B is the intended part number?

[JDL]

Yeah that's an error. If you look at the picture you can see that 17.2 is actually the Ah rating. And I don't think there are any differences between the NP18-12 and NP18-12B's.

[Al Skierkiewicz]

Chris,
The correction has been made in REV D of the KOP checklist. The difference in the suffix relates to the terminal configuration. B for nut/bolt attachment to terminal.

[yarden.saa]

Yesterday our Crio wrote that we have 17.2 volts in the battery, anyone know why?

[Al Skierkiewicz]

Yarden,
You didn't have the battery connected to a charger while the robot was on did you? The dashboard display is sampled by the jumper on the analog in slot 1 of the Crio. If you do not have an analog module in slot 1 you may be seeing a false reading, noise or some other input.

<R61> A National Instruments 9201 module must be installed in slot 1 of the cRIO-FRC . An analog breakout must be connected to this module. A jumper must be installed in the “Power” position (two outer pins) on the analog breakout. The analog breakout must be powered from the PD Panel. (Please refer to the 2011 FRC Control System Manual for details on these connections.)

[JDL]

Originally Posted by Al Skierkiewicz

...B for nut/bolt attachment to terminal.

Huh, they must have changed their numbering system slightly. I have used the same Enersys batteries (nut and bolt connection and all) in telemetry system UPS's and every one I have ordered was just NP18-12, no B at the end.

[Al Skierkiewicz]

JDL,
Your stocking distributor may only stock one type so their in-house part number may not contain the suffix. The 'B' explanation comes from Enersys documentation. Most of the other terminations types are used in special applications.