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Not all cells discharge at the same curve, some sag a little and the curve goes down a bit quicker, some sag then level off/ plateau before the curve begins again. On ES the recent cycle ageing tests show some even spike a little before the gradual curve goes down again. All you can do is ride...

As long as you can somehow secure it to the bike with straps or bungies it should give you an idea if it is the battery.

Quite right I prefer it when vendors use plain speak as to say.

Quite easy you select the text STYLE from the header bar in the post reply box.

A sub £200 15ah battery no idea what cells are inside probably unbranded China cells or really low power branded cells. https://www.ebay.co.uk/itm/36V-15AH-E-Bike-Battery-Electric-Bicycle-Li-ion-Pack-Lockable-w-USB-Charge-Port/124183096584?hash=item1ce9e3ad08:g:k8EAAOSwx9pepkoV

If you scroll down the pack sizes are there so you can see if they will fit your triangle.

I don't know what you call not a fortune ? You get what you pay for with cells and batteries you can opt for any cheapo battery from about £149 on ebay or go for one that costs a bit with good/v,good cells. This 60 cell 29E should last at least 6 years and is a top cell and class leader I it's...

Enerprof. https://www.ebay.co.uk/itm/Tongsheng-TSDZ2-Mittelmotor-36V-250W-Pedelecs-Umbau-Edition-2020-Rucktrittbremse/254591122635?hash=item3b46d03ccb:m:mWT7soIYVD1Z30KgkrAVGFgEnerprof.

The fact you can stop the motor wheel sounds like the battery hasn't much guts to it and is lacking power.

No Alan is certainly doesn't, 4.13v is a tad low and does possibly indicate the battery may have higher cell IR and voltage may be sagging. You can temporary wire up a cheap £2 voltage gauge to see what occurs voltage wise when you ride the bike under load.

The Germans turn a blind eye to them as we do, the kit scene is bigger there then here. You only have to peruse pedelecs forum.de to see how big it is.

Simple answer is no hub internals won't slide in. Use a bit of heat on the pozi screws and then a tap using a torque drive screw driver the type you smack with a hammer.

Woosh Rambletta. https://wooshbikes.co.uk/cart/#/product/uid-238-rambletta/rambletta-with-rigid-fork-version

It has a BMS if you look at the specs lower at internal battery protection.

Woosh have limit stock so not sure what is left. Have a look at Raleigh design bikes marketed under the Kudos cycles brand name. http://www.kudoscycles.com/index.php?intro=done&osCsid=71t45d3qoga4j9a8rgo0fgre53 The old Safari still has some merits and at a bargain price <£700, the slightly...

Error 30 is communications fault between controller and display so the fault could be any of those two or the wiring connecting the pair. If you have a meter manually check the battery voltage as well at the discharge pins.

The battery is likely no good or can't deliver the current load asked of it. Using the C5 setting change the parameter value to 4 which is I think 50% current value and see if that helps first.

The Blue connector/PAS for sure is Red/Voltage, Black/Gnd & Green signal. The Green connector/throttle is Red/Voltage, Yellow likely Gnd & Green likely signal. though the Yellow & Green possibly could be the opposite, checking the pin outs on the board might help. If you have meter with the...

Now I understand the pin out sockets are exactly the same. Show us a pic of the PAS & throttle wires/connectors, I'm particularly interested in the colour sequence.

Jimmy at ebikebatteries.co.uk.