Sorry if it is in the wrong section but there is not a correct section and since many portable devices are charging lithium packs I put it in here.
Please see the photos. The model is -> NKY341B2 (26v @ 8AH).
Googling does not give much information. But I have established it is a nominal 26v pack when flat and 29.4v fully charged.
I can buy a universal charger off ebay at exactly 29.4v, charging at 2A. It is the perfect voltage and current limits but has only plus and minus no data signals.
On the photo you will see from left to right connections:
T -> Measures 10K to ground approx and varies, not sure if it is a thermistor?
- -> Ground/Negative connection.
S -> Is open circuit to ground.
C -> Positive via a 5amp car fuse.
+ -> Positive via a 30amp car fuse.
Note that the C and + connections are soldered together after their respective fuses.
If I connect + and - to the pack it will start charging for exaclty 60 seconds then stop.
If I dis-connect the power leads and re-connect nothing will happen.
If after it has stopped I short T to ground or S to ground it will start again and usually the gauge lights up also.
If I leave those connections shorted in any combination it does not help. It always stops after 60 seconds unless I re-short them every so many seconds, the gauge will light after about 10 seconds so it acknoledges after waiting 10 seconds to re-short.
Does any one know exactly what T and S are? And what is the pack expecting on those terminals?
The S and T inputs are very sensitive, If I touch the metal tweezers to one of them but insulate my hand with paper it will still start charging, how is that so?? But only with a metal object.
Could it be expecting a voltage on one of these terminals or a data signal?
T goes to the board and is labelled ID.
S goes to the board and is labelled Comm Pack. Maybe communications?
The original charger is not available to buy any where and we do not have it!
I do not have the bike here but I have thought maybe if it is left connected in the bike it will carry on charging if I hook up a socket on the side? It is my friends bike. I will try that when we have chance to get a lift with it.
I suppose a circuit could be made that continually connects and dis-connects T to ground every 10 seconds!
I tried using a resistor from T to ground but no difference.
It will also start with me touching the T or S connection, no need to ground.
I can charge it fully by bypassing the main board and connecting to the main cell terminals but this bypasses any safety and the gauge would not update so not ideal.
Many thanks.
Please see the photos. The model is -> NKY341B2 (26v @ 8AH).
Googling does not give much information. But I have established it is a nominal 26v pack when flat and 29.4v fully charged.
I can buy a universal charger off ebay at exactly 29.4v, charging at 2A. It is the perfect voltage and current limits but has only plus and minus no data signals.
On the photo you will see from left to right connections:
T -> Measures 10K to ground approx and varies, not sure if it is a thermistor?
- -> Ground/Negative connection.
S -> Is open circuit to ground.
C -> Positive via a 5amp car fuse.
+ -> Positive via a 30amp car fuse.
Note that the C and + connections are soldered together after their respective fuses.
If I connect + and - to the pack it will start charging for exaclty 60 seconds then stop.
If I dis-connect the power leads and re-connect nothing will happen.
If after it has stopped I short T to ground or S to ground it will start again and usually the gauge lights up also.
If I leave those connections shorted in any combination it does not help. It always stops after 60 seconds unless I re-short them every so many seconds, the gauge will light after about 10 seconds so it acknoledges after waiting 10 seconds to re-short.
Does any one know exactly what T and S are? And what is the pack expecting on those terminals?
The S and T inputs are very sensitive, If I touch the metal tweezers to one of them but insulate my hand with paper it will still start charging, how is that so?? But only with a metal object.
Could it be expecting a voltage on one of these terminals or a data signal?
T goes to the board and is labelled ID.
S goes to the board and is labelled Comm Pack. Maybe communications?
The original charger is not available to buy any where and we do not have it!
I do not have the bike here but I have thought maybe if it is left connected in the bike it will carry on charging if I hook up a socket on the side? It is my friends bike. I will try that when we have chance to get a lift with it.
I suppose a circuit could be made that continually connects and dis-connects T to ground every 10 seconds!
I tried using a resistor from T to ground but no difference.
It will also start with me touching the T or S connection, no need to ground.
I can charge it fully by bypassing the main board and connecting to the main cell terminals but this bypasses any safety and the gauge would not update so not ideal.
Many thanks.
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