freddd

Hello, are there batteries that can be left connected to the ECU but charged via a separate lead (Duralite type ot other) or do you always have to disconnect. thanks

GrayUK

I would recommend always disconnect to avoid any possibility of damaging the ECU.

Paul

Harley Condra

My Feedback: (4)

A word of caution when charging a JetCat ECU battery:

The JetCat ECU battery must never be charged until after it is disconnected from the ECU.
The charger will damage the ECU, requiring factory repair.

DelGatoGrande

My Feedback: (23)

here ya go!

http://www.powerbox-systems.de/e/pow...tery/start.php

http://www.dreamworksrc.com/catalog/...oducts_id=1237

schroedm

My Feedback: (1)

What is this for?.....(4th item up from bottom)

http://www.alshobbies.com/shop/search.php?Desc=tamjets

Rgds,
Mark

Carsten Groen

probably for connecting the Tamjets smoke pump, there is a similar cable with the Tamjets smokepump kit

Carsten Groen

But why ?
It would be nice with a technical explanation why "must never be charged....."

The voltage from the charger (balancer) will never exceed the 4.2V (not by much) per cell (even if so, there is a margin up to 3S as the Jetcat ECU was designed for (but which Jetcat warns against))

MF Boy

I'm sure I was told that certain chargers were OK with this. Not sure about the later ECU's but earlier ECU's using Ni cells will take a "trickel" type charge without causing a problem.

At the end of the day having an additional plug and socket that you can split for charging can't be a problem.

Matty

Tom Antlfinger

My Feedback: (24)

It is not the voltage which damages the ECU, it is whether or not the charger is a so called "pulse charger". This applies almost exclusively to some NiCd/NiMh chargers, which alternate small reverse polarity discharge pulses between the higher voltage/current charging pulses. There is no reverse polarity protection on JetCat ECU's. If you plug your battery in with the leads soldered in reversed, you instantly fry the ECU.....same thing applies if you apply that negative going pulse during charging. Instant death to the ECU.

Jetcat USA recommends always disconnecting the plug from the ECU just to be extra safe. If you know for sure your charger does not use the negative pulse algorithm, then no problem with the battery plugged in, but why take that expensive fried ECU risk? You still could conceivably damage it from a spike induced by connecting/disconnecting an energized charger, similar to the spark induced by pulling a lit lamp from a wall socket.

GrayUK

Nail on the Head!

Harley Condra

My Feedback: (4)

Tom has correctly expounded on and covered the point I was trying to make.

To quote the JetCat Instruction Manual V6.0 page 23:
Charging The Battery
Do not charge the battery, with a quick charger using negative discharge pulses, when connected to the ECU.
This will destroy the electronics of the ECU. The only recommended method is to disconnect the battery from the ECU and charge it directly. If you are absolutely certain that this is not the case with your charger, the battery can be charged using a Y cable."


Use a Y harness at your own risk.

freddd

This would suggest that LIPO or A123 are potentially OK - but i won't be the tester...

MaJ. Woody

My Feedback: (28)

I always solder a deans connector between the battery and ecu. I disconnect at this point for charging.