What battery/bike connector is this, and can I make a simple adapter for a Bosch PowerTube?

[eekee]

Hullo! I got my old ebike out again, "the Urban", and found it's better suited to my current state of health than my newer ebike, Old Grumpus. Old Grumpus is so called because it's not gonna assist unless you're doing your bit, and it's kind-of falling apart anyway. The trouble is the Urban's ebike's battery hasn't entirely survived storage and I need to fix this on as tight a budget as I can. Here's the Urban pictured with the batteries from both bikes:



The square battery is the Urban's. It's marked HC-36V10.4Ah-S-OE-OQ-012091 which gets no results when quoted in a search and irrelevant results when unquoted. The round battery is a Bosch PowerTube 500. They're both 36V. What's the 4-pin connector used by the bike and its battery? Can I make a simple (wires-only) adapter to power the Urban with the Powertube? If yes, will my display show the Powertube's state of charge?

 

[amberwolf]

I believe the Bosch batteries only work on the Bosch bikes with the Bosch chargers, but it depends on which version you have. There are a number of threads that mention or discuss the powertube batteries that might show you which ones won't work on other systems; I'm not sure if ther'es a list of which ones will work on ohter systems.

In either case, the connector on there seems to be a proprietary one for that specific system. (like pretty much everything else on the bosch bikes).



The Urban battery looks like a pretty generic type with a common blade type connector. the stated marking probably means it's 36v nominal (42v full) and was originally 10.4Ah. Doesn't say what it's amp (A) rating was; you'd have to check the controller to see what it's current limit is to make sure any replacement battery is capable of powering it without stress or damage.

What was the brand and model of the bike it came from, and about what year was it made? Might give some info about what curent it requires without disasembling the bike to get to the controller (which is probably under the battery connector on the bike).