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Two wires indicate a simple reed sensor.

You don't need to buy an ebike specific chain, std bike ones wil do the job and cheaper too.

Freewheel or freehub pawls stuck ? Take the chain off the gear cluster and see if it turns ACW by hand.

Nimh is what they are now you have actually told us what you have. Nimh should be able to charge to 1.4v - 1.5v per cell and up to or near 30v fpr the battery pack. The old Nimh pack I have only charges to 24v max and is 2006 vintage, the cells are shagged for bike use. The bike in question (...

Problem with brake sensors is when one malfunctions you don't know which one, I only use one on the rear. Two brake cut outs are just not necessary.

The Macwheel isn't unlike the Oxygen ST step thru, the frame is fairly generic stlye used by sveral sellers, I think the NVM Moscow model is one. The issue is CS and after sales back up and no reviews. Also crappy cable disc brakes. The Frappe? No doubt it is a fine bike the Shimano E6100 is...

Also check the pedal sensor gap between it and the magnet disc, also check magnet disc doesn't rotate freely on the bb axle.

All bikes are China/Taiwan made even the likes of Bosch. Nothing wrong with Chinese e bikes they are the world leader in production.

A battery of this age is likely to be well past it's best, ageing being the major factor of the cells. 24.5v is 3.5v per cell/cell group which if it is the max charge they can rise to, means they are shagged out. A 24v battery assuming 7s will be 29.4v fully charged or 4.2v per cell/cell...

Storing Li batterie's in the cold is fine but charging them when they are stone cold isn't.

Only a fool would buy an impulse drive Kalkhoff bike today , unless of course as has been mentioned you can get it very cheap sub £200 and if it lasts a year or two it is a good deal. Impulse bikes are tarnished and none now are worth more then what has been mentioned.

Ideally you need to wire a watt meter or a voltage meter in line to see what occurs with the voltage when the twist and go is used, I expect one would see the voltage collapse then the system shuts off. If so then the battery is passed it's best and simply can't take the high current asked.

No, not without knowing exactly which PAS system is fitted. We need pics of the bottom bracket area.

You have already told us the PAS once worked. What is being asked of you I which PAS system was /is fitted as there are two types. Cadence PAS uses a wired sensor trapped or fitted by the Bottom bracket and a magnetic disc that rotates with the crank. This simply can give max power with little...

If you need more range ignore the throttle and use eco as much as possible.

Batteries are fine in the cold dry garage, damp is what they don't like. Storing in a cold dry garage is good but charging isn't, so by all means in the garage is fine but remember to allow the battery to acclimatise indoors before charging. Store at approx. 40 - 70% of voltage but it isn't...

Best cell/s depends on usage. Does one want high current for discharge or max capacity for range, there are many variables to consider. For overall value Sam 29E is one of the top cells though best suited to larger batteries with many cells in parallel. 10A cells LG M29 are good for low/med...

When you have removed the six plates screws on the rhs also remove the LHS in board axle nut that keeps the end plate bearing seal in place, then you can tap it out if a bit tight. Give all a good clean if grease is hard or feels gritty. Check the gear cluster for worn bearings ensure rotation...

Riding time wise is about 7 -8 hrs, a nice partially planned ride out. Rest wise as little or much as circumstances out and about require, I will stop for about 20mins to eat my bit of food, usually moist packet fruit like dates, prunes and apricots. Nana's are a no no as they get smashed...

6k is good without no issues up to now, it may just need a service. New bearings and a grease up, there isn't much else to wear or go wrong as long as water hasn't in-gressed inside. Clutch nylon gears can be inspected and even the clutch bearings are usually replaceable. Two of my Bafang's...