Check the model number. Mine looks exactly like the one pictured here.
Again, my trimmer model 9854L has the battery soldered in place. So, unless you have a soldering gun and tools, or want to buy one and do this job, don’t bother with the rest of the steps here as this is required for battery replacement.
I have found a similar spec’d battery on a couple of websites. The battery is 3.7 V, 750 mA and coded W14500-750.
Again, my trimmer model 9854L has the battery soldered in place. So, unless you have a soldering gun and tools, don’t bother with the rest here.
Be careful- mine popped open suddenly and all interior parts fell out! Also, as mentioned above, be cautious to not push against the silver metal motor axle while opening- use the white plastic to the side as a spot.