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Sometimes when batteries are on there last bit of life they will show fully charged.. they will have the voltage specified, but, not have the amperage needed to drive the tool. It takes minimum amperage to get the blade to spin, but when you put a load on the tool, the battery doesn't have what it takes to handle the load.
It takes amperage to make the tool work under load..not just voltage. Sounds like its time for a new battery.
it's never the motor, it's always the batteries.
you are most likely testing the batteries with just a meter and not under load
you will need a tool to put the battery under a load, it will end up costing more than two new batteries.
just replace the pair and you will be fine, i have done enough of these over the last few years.
good luck and you will have no problems with the new batteries.
The black plastic ring is secured on the clear tube that you can see the corkscrew through with four little plastic snap tabs. I used a pair of channel locks to gently pull the ring off those tabs. Once you do that you have access to the inside of the clear tube and can reverse the corkscrew and get your broken cork out. Blow debris out and reassemble. Good as new! Even if you break one tab it should still hold, and if you break multiples use some super glue to hold it in place, that will be your last chance to fix it, but at least you've doubled the life of your toy. Good luck!
Check the voltage when under load (starting) if it drops below 9volts then the battery is sulfated and you'll need a new one. I had this recently with my K1100. Battery read 12.8 volts across the terminals but fell to 4 v under load. New battery fixed it.