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54.5v is good your meter may not be 100% accurate, now the charger is at 54.5v that is good. Charge and discharge the battery several times to give it a chance to re - balance now that the charger voltage is correct, any low cell groups might sort them selves out. Keep checking the battery...

Double check and measure the chargers voltage on the charge connector, it should read 42v when plugged in to the mains. Also measure the voltage of he battery at the discharge connector, tell us what it is should ideally be 41.5v - 42v.

Looks like you retrieved the bike from a dutch canal ….. The fully charged battery should be 29.4v, it has 7 cell groups in series each one 4.2v max. 28.3v is 4.04v per group it might just be out of balance, without surgery it may re- balance better after several charge /discharges or try...

A tadpole trike may be better though they ain't cheap, much more stability though.

I have seen the odd hub where the motor wire doesn't exit via the axle. Some drop outs aren't always suitable to go deeper so if you can fit another TA then all the better, just makes puntures a little more of a faff unless you opt for TL set up or use Gaadi's. The reason for AR washers or TA's...

Treat the buy as needing a new battery, most sellers haven't a clue about the battery and can you really trust them, they wan't shot of the bike otherwise they would keep it. A new battery will be about £150 - £200.

What type of battery or bike ?

This is another calculator and Nexus/Alfine 8 can be selected. http://www.gear-calculator.com/

Hub gears rule out using a very high /high torque rear hub motor, so you will be looking mainly for a mid drive/center motor drive bike, though a front hub isn't totally out but they are not ideal in winter in wet/slippy conditions on inclines.

As pete say's first the charger needs sorting so it reads 54.6v on the charge connector. Once that is in order the battery might re-balance slowly over a few charges 3.3v isn't disastrous and is recoverable.

Yep the battery is dead with those voltages, unless you have a spot welder then no. JImmy at ebikebatteries.co.uk will re-cell he arranges couriers both ends, give him a call.

The anti rotation washer(with bent tab ) ideally should sit into the drop out, though it isn't a good AR washer as the tab isn't at right angles. The axle needs at least I think to sit 2 or 3 mm deeper so the axle nut can sit on the meat of the flat drop out area better, as it is not all of the...

Yes the multiwire connector with the ten White & one Black wire, carefully pull it out/disconnect it from the BMS . You can then use your meters probes on the wire connector to get ten cell group voltages, write them down 1 -10 & xxx volts. For cell group one Black probe on Black wire pin out...

0050 jpg pic, I expect that the PAS wire is the 2nd from the left, trace it to find where I think the broken end will be.

The new pics don't help much, though it certainly looks like that is the controller at the base of the battery. This is what a complete PAS sensor look like, the othe end with the round connector will be connected still (I think ) so you need to trace where it is. As mentioned unwrap the spiral...

I'm pretty sure some how you have ripped both of the wires (3x & 6x) out of the controller or a connector somewhere, you need to unwind the spiral wrap to have a look. The PAS wire has been snapped pretty clean so there must be a tail end for it somewhere which will be connected directly to the...

The lighter bike will pedal better. The electric bike will depend on the motor technical specs, it might be good for cruising on flat ground but not very efficient on hills.

Controllers are either external wired units in an aluminium box or are integrated in to the battery base, even a throttle still has to run via a controller. Let us see a more general pic of your trike. Can we see a more general pic of 0048 jpg as that looks like it might be an integrated...

Err no !!!! Without a controller you can't do anything, the pcb is programmed and uses signals via the wiring. If you can't get a replacement controller then you will have to buy a new controller kit, cost will be about £100 for a good Lishui or KT brand.

The two wires one three and the other six don't join to each other they must go into a controller and solder to the pcb and you must have ripped them out of it. The six wire one looks like it is the hall sensors for a sensored hub and has tails of unequal length they either go in to a...