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Oset 16 battery issues

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Hi there

Having issues with using this battery pack in a 36v oset 16. Details below

36V 10ah Li-ion Battery 10S 4P for 350W~750W

Built-in 15A BMS 36 volt 10ah lithium battery. With 36 / 42v 2A charger


Battery parameters:


Battery type: 36V 10ah


Rated capacity (ah): 10ah


Rated voltage (V): 36v


Technical description: 3.7V 18650 battery


Unit combination: 4-parallel 10-series


Battery size: 70 * 85 * 190mm (± 2mm)


Number of batteries (parallel * series): 40.


Discharge voltage (V): 30 + / -1v


Charging voltage (V): 42v


Rated discharge current (a): 15а


Instantaneous maximum discharge current (a): 30A


Maximum continuous discharge current (A): 15a


Charging method: CC / CV


Standard charging current (A): 2A


Standard charging current charging time :4h


Maximum continuous current charging (A): 5A


Quick current charging time :2 hours


Charging temperature range :0-45℃


Discharge temperature range :-20-60℃


Battery weight: about 2kg

Its only a cheapo Chinese job but its annoying none the less! 

The battery cuts out as soon as you switch it on. Battery output drops from 42v to 3.6v or thereabouts. 

Any suggestions? 

Thanks in advance.


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Everything ok with a genuine battery? if so I would just send this one back, anything chinese can have some very bad build quality issues and even safety issues.


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Not worth sending back tbh as shipping is difficult and expensive. 

Should be ok with that spec power wise?

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If the battery volts drop as soon as you turn the bike on then it has a fault ( that’s called the load ) or the bike has a fault, as suggested above does the bike work with the standard battery or do you not have one.

Perhaps you could give a bit more history of the problem to enable a remote diagnosis, ie was the bike working O.K. in your ownership, why have you replaced the battery etc.


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The bike worked fine with sla batts but run time was dire. When the last ones went bad I bought this li ion battery pack. 

The bike went OK on the first charge with this pack but then started this issue. 

Charge the pack, plug it in. Sometimes it stays on and you can get a couple of minutes run time before it cuts out. Most of the time you hear the relay click on (measures 42v at the battery) then it clicks off straight away (measures 3.5 ish v at the battery) and the lights on the throttle go out, relay clicks out. 

Is it a bms issue perhaps?

I have been through and cleaned up all the connections/ relay contacts etc and checked wiring continuity. 

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You say the original run time was dire, what’s that 10 minutes, 45 mins ?

You then say the new battery was O.K. for its first use, better performance or much longer run time ?

You could have a motor fault that’s dragging the battery down, as you say the volts drop to 3.5v when loaded or of course you may just not be fully charging the battery, have you got the ability to measure amps on your meter ( I assume you have one as you are taking readings )

Do you still have the original battery ?



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Sounds like a faulty battery pack, but one other item of concern is the BMS in your pack looks to be rated for a max discharge rate of 30amps which is quite low.  Bike should still move, but I'd expect it to stutter or cut in and out under full power.  

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