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Issue with charging battery

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own
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 own
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(@own)
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Joined: 2 years ago

Hi

Due to an accident I stopped using my Super Soco TS for like 5 month i guess, and i shut down completely the bike and didn't charge the battery.

Today I tried to charge it but the charger show me a green light, mean the battery is full but when I want to start my bike , it indic the battery is at 0% and I charged it for like 2 hours

Should i continue to let the battery charge or i need to buy a new one ?

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socomods
Posts: 96
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Joined: 3 years ago

contact your dealer, the low-voltage protection has kicked in and it will not charge, so no point leaving it connectedbut

Β 

they may be able to reactivate it (bare in mind that this would come under a breach of warranty, so they might charge you something to do it)

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own
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Thanks for the reply

But due to the Corona virus , can we do this thing at home or only at a dealer?

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alexaraducristian
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Not even you're dealer may be able to revive the battery.

First try to measure the battery voltage using a voltmeter. Use the big holes from connector. There you should find a voltage between 50V and 71.4 V (this is the maximum).Β 

Try also to measure also the output voltage of your charger, just to be sure it's working (71.4 or 69.7V).Β 

To revive the battery... in case it is indeed dead and you'll measure very low voltage (like 10V), you'll need a special charger or open the battery and revive cell by cell using a parallel connection with another good and fully charged 18650.

(Update)

Actually should work if you connect an exactly the same battery to your dead one... though might be difficult to find an identic battery elsewhere than your dealer πŸ™‚ But this will not damage the good battery and will not cost your dealer more than few minutes, but hard to revive by yourself at home.

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own
 own
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@alexaraducristian

thanks I'll measure the voltage as soon as possible

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socomods
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the BMS can be accessed via software to switch protection on/off and allow a recharge attempt - but the dealer or authorized service center are only place you will find that probably

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alexaraducristian
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@socomods not sure if the BMS is responsible with this protection. Are you sure?

Because if it is the BMS, I believe it whould be much simpler... open the battery and bypass the BMS in the way of connecting the charger dirrectly to each group of parallel cells. 

@own did you measure the voltages (both battery and charger)? Did you also tried to contact the dealer?

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socomods
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@alexaraducristian

Β 

you could bypass the BMS to charge yes (not a great idea tbh, especially with batteries which have been discharged for too long), but whether it will power the bike depends on how the BMS sets the low-voltage protection cut off, ie if it stores the value (off/on), or if it simply checks the voltage and decides whether to allow charge/discharge

Β 

(yes the BMS controls over charge, under charge, low voltage and high temperature cut offs)

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