[Christ]

Thanks, Bob!

The PM's noted above were between myself and Bob, regarding how to properly charge and maintain the NHW20 battery modules that I've just gotten from a purchase on eBay.

Questions had been raised about proper charging procedure and safety everywhere I've posted about using the batteries for projects, and when someone posted a link to a site which contained the pictures above, I found it necessary to message Bob for further information. After some discussion, it was suggested that we take the discussion public, so that more people who might have relevant information could chime in and suggest a proper means of mounting, charging, and maintaining a single 7.2V 6AH module.

That said, fire away!

A few questions that I'd personally like to have answered are:

Whether or not the modules can be mounted on their side (using the ~25mm dimension as it's height) without potential problems.

Whether the bike's alternator will charge the battery directly, or need some sort of intervention process to keep from overcharging and destroying the battery.
(The bike's electrical system is 6V, the AC generator charges through a rectifier at a rate of ~7.5V 3.3A at 5k RPM, 8V 6A at 10k RPM.)

How to properly monitor the battery's SOC and voltage, since they're apparently non-linear. (Gauges? Complex charging circuit? VooDoo?)

Thanks to all in advance for suggestions, and hopefully a collective of knowledge and input on the topic can help more than just myself and Bob.