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The nine pin motor connector is commonly known as Julet water proof connector and is common with nearly all generic type hubs. One exception is the Suntour Hesc. How the end at the controller mates who knows, but yes some disassembly will be needed to see or at least the battery case will need...

All I can add is that Orbea say their sytsem is a range extender via charging the in frame battery. The other bike brand if they say it is in parallel have in place a different electronic system that routes the power separately then Orbea uses.

The only safe option is to use the official extender for the bike. It is the reason why they can charge a lot of money for the meagre range extenders usually preventing cheaper third party options.

The Orbea isn't the ebikemotion though and though the same extender might be used the Gain may not have the same electronics on board. The Gain may just use the extender as just that to charge the main battery where as the ebikemotion may be paralleling in the proper sense.

The controller yuan lang, I don't think you will likely ever find one unless OEM on a bike. To confirm whether the controller or motor is at fault one will have to carry out some tests. Easy test with no battery power, can you turn the motor wheel forwards by hand with controller connected ?

Battery slides out from the bottom so controller likely in side the battery tube. PowerPoint Presentation (furosystems.com)

The controller likely may be a tube type and likely be concealed at the base of the battery or even in the removable battery tube, access one would think will be via an access cover at the top or the bottom of the frame.

It is a good job you raised the issue/subject as it is obvious the extender electronics control the discharge/charge to the main battery, a third party battery would not do so.

As mentioned paralleling isn't to be toyed with without good knowledge or the whereabouts to add extra wiring. The wording is ambiguous and gives the impression that the battery is being paralleled by saying it increases range and battery wh to those who don't truly understand what paralleling...

As I originally thought. Having read the from the official Orbea page, it say's the range extender (when switched on) act's an on bike charger for the internal battery at a charge rate of 2a. I would not be connecting any third party battery with out modifying the existing wiring between...

So it looks like the internal battery has electronics to deal with adding a propriety range extender but whether the range extender also has extra protection one doesn't know but assumes so. A third party battery as you have shown I doubt will be the same and certainly not have any electronics...

It might be then that the the BMS is a same port BMS, this means it charges and discharges from one BMS line/port. The discharge and charge wiring separate internally from the same BMS port, if that is the case then one may be able to connect a second battery but I can't see they will be in...

Can we see a pic of the BB/crank area from the side and underneath pls.

My bad I was wrong, it indeed appears to be possibly a speed controller (maybe) with 5 PAS levels. Most propriety control systems only use 3 wires and 4 wires is the domain of TS control systems. I'm pretty sure you will find it hard to find a 4 wire PAS disc /sensor and the only route is...

Right gleaning info from the two posts so far, it isn't working. First of all how old id the bike & battery? One will also need to check the battery voltage properly using a meter that is outputs 41.5v - 42v when fully charged.

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This is a pretty good explanation with pics /drawings. Parallel batteries (again!) | Pedelecs - Electric Bike Community Done correctly one can use differing chemistries, I have done some with lipo and lion in parallel. The caveat with lipo is I also always have alarms on them and once one...

One will need a schottky or one way diode device in each battery supply feed on the positive line.

What ever way one looks at it correct and proper paralleling is two or more batteries linked up and both discharging proportionately together. Bosh have a twin battery set up but is not a parallel set up as it sips power from one battery at a time, I believe switching between them. Paralleling...