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Charging Ecycle lipo batteries with a lead acid charger

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dr pepper

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I have got the mrs a ebike, it has a 36v 15ah battery pack.
I have a 1.8a 'intelligent' lead acid charger, only its not intelligent, it charges at 1.8a constant current, up to some voltage then switches to a taper charge, it has a uc3842 smps chip and a Lm358 op amp.
Open circuit voltage is 42v, which is correct for a 10s lipo, the question is would the lipos 'like' the taper charge, or woudl the charger not even get into that mode.
I got the pack as a load of panasonic cells welded together, and I of course got a Bms Pcb to go with it.
 

audioguru

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Since you will use a charger that is completely wrong to charge a Lithium battery then the battery will probably explode and/or catch on fire.
A multi-cell Lithium battery is usually charged with a "balanced" charger so that each cell gets a maximum of 4.20V. Without the balancing then the weakest cell will over-charge then explode/and or catch on fire.
A Lithium charger senses the charging current dropping near a full charge then shuts off the charging to avoid an over-charge explosion and/or..... because a trickle charge must be avoided.
We do not know any of the features of the Bms that you have.
 

crutschow

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As AG noted, use that charger for your lithium batteries only if you are looking to be a candidate for this year's Darwin Award. :eek:
 

dr pepper

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Already done.
The overcharge stage is disabled, the charger is now a 1.8a current limited power supply, just as per a lipo charger, in fact probably better than some imported ones.
The Bms does the rest for me.
 
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