Stihl MSA AP300 flat battery reboot

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My Stihl MSA AP300 battery had gone flat, i suspect as left sitting idle on cold shed shelf it had dropped to less than 6 volts and would not recharge in cradle.

I explored some yotube vids where operators hooked up MSA battery's with jump start wires and rebooted dead battery.. But as i could not work out which blade terminal was + or - and bit fearful of fizz flash or bang! I took it to a specialist battery store the chap checked tested & put it on his (defibrillator) battery charger and rebooted it.

Yay brought back to life this saved me some bucks.
 
Bleep! The lengths manufacturers go to prevent owners repairing their own equipment is maddening. (find Louis Rossmann on youtube). I searched the internet for a pinout diagram. No luck. Personally, I have AK series batteries, but I think the pinout is the same. Anyway, I'm peeved enough to make the effort.
If you want to try this, you can use a welder set for DC, 36V to zap the battery.
Stihl AK battery pinout.jpg
 
Is there a reason you can't hook a multimeter up and see what the polarity is? Has the BMS shut it down entirely , so there's no voltage at all to be read?

I have a benchtop power supply that I used for top balancing my solar power cells, and it would probably work for this also. One of those things I put off buying until I had a real need, and now that I have one, I seem to use it all the time.
 
Is there a reason you can't hook a multimeter up and see what the polarity is? Has the BMS shut it down entirely , so there's no voltage at all to be read?

I have a benchtop power supply that I used for top balancing my solar power cells, and it would probably work for this also. One of those things I put off buying until I had a real need, and now that I have one, I seem to use it all the time.

I dont have multimeter only a probe current tester that pins would not fit into the battery blade gaps plus im not super confident playing with stuff i dont know so left it to shop battery specialist. The Stihl shop tested the battery found it cell continuity ok said it read 6 volts so below reboot level.
 
I dont have multimeter only a probe current tester that pins would not fit into the battery blade gaps plus im not super confident playing with stuff i dont know so left it to shop battery specialist. The Stihl shop tested the battery found it cell continuity ok said it read 6 volts so below reboot level.

Multimeters are incredibly cheap, and good for a pile of different things. Surprised you don't have one.
 
Loaned my Stihl batteries and mower to a friend. He ran several cycles thru both batteries. Something happened and both batteries are now inoperable with 4 flashing red lights. The first battery had two banks of cells at 3.8v and the rest at 3.5v. Used a hobby charger to get all of them back to 4.1v, entire pack reads 40.8v, but the battery management is still in a locked state and it won't let the tool draw any power from it. Charger just flashes a red light when plugged in.

What specialist store did you take it to?
 
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