Biker44

AI Overview - Check important info. Learn more Yes, that's correct. One horsepower (hp) is equivalent to 746 watts (W). This conversion is widely used in the measurement of power, especially when referring to engines and motors. Explanation: Horsepower (hp): This is a unit of measurement for power, historically used to compare the output of steam engines to the power of horses. Watts (W): This is the standard unit of power in the International System of Units (SI). Conversion: 1 horsepower (hp) is defined as approximately 746 watts (W).

Is there a useful tip in there? Can it be that I could easily have recovered the 2.5 year old Bosch 400 Battery on my 2017 c7+ Gazelle with the dinky toy people here helped me find? Obviously can't do it now.

Did you get an answer to your FOI?

Several useful tips from you there, thankyou. The decent length of two core cable I have (from a mains vacuum cleaner?) could be good for up to 2000 watts, roughly 8 amps at mains voltage. It should handle 2 amps at 45 volts (nominal 36volt battery) with no trouble. I note what you say about checking polarity! The 50 volt power supply comes with its own "multi-meter" style male connectors ending in pretty tiny insulated crocodile clips. Instead of which, I will use ring terminals on the supply that came with a lead with an inline fuse. I think its about 10 amp protection.

Ah - thankyou. I can go ahead wiring it up with the tidy length of two-core cable I have. I wasn't sure what sellers-information I'd seen provided on a flea-bay (?) link.

Whoopee - XLR connector arrived - did I see that two of the three pins can/should be connected together? If that's right, I can use my nice long length of 2-core rather than cutting up a decent 3-core extension lead.

I'm a neophyte. I'm depending on you guys to bring me up to speed and leading me to the sun-lit highlands.

Thanks for the tip - are we to understand that the picture above (from our friendly deliver-to-your-door box-shifter) is pushing the bounds of crediblity? That would be sad, they're usually quite good. However, the safe charging rate of our e-cycle batteries is probably only around 2 amps (that's the limit of what our chargers currently deliver). Someone tried to sell me a three amp charger (at £100!) claiming "it would be faster" - without any kind of explanation, I'm afraid I politely declined. The new power supply is still easily capable of blowing up my batteries (in the concrete lined passage-way where I plan to use it) - I will have to be super careful. But I will (briefly) double check what you've said about maximum current at maximum voltage before sanity returns and report back.

Ha! Thankyou! I've found it! Just £55 from a box-shifter-brings it to my door! Why are no other Bikers beating a path to this mans door? There's even a 120 volt version for only five squid more.

A video almost impossible to follow. Whereas this video - - makes the same thing look ridiculously easy. At least in theory - in practise, the once highly regarded GOPHERT CPS-3205II (Portable Adjustable AC to DC Variable Switching Power Supply AC DC Converter 110V/220V switchable Great for Provide Constant Voltage or Current Supply) has vanished from reputable suppliers (Amazon and so forth) - "Currently unavailable. We don't know when or if this item will be back in stock." All is not lost - there are many other suppliers of the same thing. However, there's a hitch. This power-supply ("charger") does 0volts to 30 volts and a 36volt lithium battery probably needs up to 50volts. So, suppose I wanted to manually charge such a ("Silver Fish style" in an ali Extruded tube) battery, how would I do it?

My experience (three e-cycles) has been that 3 years is about the limit. This covers both the aluminium Extrusion type (2010/2012 vintage) and a Gazelle Bosch PowerBank (failed in 2.5 years, though a question mark over whether it was truly 2017 vintage). When they go, its quite quickly (the Bosch battery very suddenly, presumably in the BMS) There doesn't seem there is much you can do to improve this.

How did you get on? I'm looking for a battery for a Gazelle c7+ which seems to have been discontinued very early.

The Chinese are alleged to know all about this problem and have solved it - many/most cycles are charged outside. It would be a tragedy if robust methods to protect people are not implemented. See

Do I get this right - these Bosch batteries only last 2 or 2.5 years and failure is notified by the "4 green lights" at end of charge? Furthermore, nobody has succeeded in re-celling them.

Checking on the web, the current models of Raleigh Motus all seem to have their batteries on either the down-tube or the seat tube. Is yours older? I'm sure I've seen a Raleich electric cycle exactly the same as our Gazelle Orange c7+, same Bosch motor, same display and similar battery position (not entirely sure if it was identical mounting).