Replacing/Upgrading a Lithium Battery for Sileno Minimo Robot Mower

In this video, I document my process of replacing the 18VDC rechargeable lithium battery on our Gardena Sileno Minimo robot lawn mower. It had gotten stuck while I was ill in bed for a while so the mower slowly drained its charge to a point of no return.
Fortunately, the aftermarket replacement battery from Amazon was much more affordable, shipped quickly, and holds a much longer charge (3.4 Ah). The mower now cuts roughly twice as long between charges.
BATTERY INFO
Brand: Exubertree
Capacity: 3.4 Ah (3400 mAh)
Plug: molex 4-wire
Model: CS-HAT315VX
Price paid: $45
(compatible with many Sileno robot mowers)

[@grahamnichols1416]

Hoorah! Right at the end of the video - how to remove the top cover. Two flat screwdrivers. I had tried for ages to figure that out. MANY THANKS.

[@TonyRomeNewMoney]

This video was very helpful, thank you. Taking off the top cover is unnecessary. Just pull the bottom cover. If you have a cordless drill or impact driver, pulling the torx head bolts is fast. I used 3M 30lb double sided tape to mount the battery. Worked perfectly.

[@sunnyday366]

Wow, "Gardena Sileno" is an impressive video! As someone who has been searching for lawnmowers without perimeter wires, I can't express how thrilled I am to see the Segway Navimow robotic lawnmower. It offers such convenience and efficiency compared to other brands. I highly recommend others to give it a try for its advanced features and hassle-free mowing experience.

[@johnnypolex]

I too would definitely go with a mower that doesn’t require perimeter wires next time

[@benprofessab1496]

I have a Greenworks Optimow….what you do you think could replace the T0100273-00 battery? 24v/4.0ah/96wh
Most times it’s in another language when I look it up

[@brabecjakub]

Thanks for the video! Have you choose the battery based on original part number? If I look for mine, it only finds... original replacement.

[@arikofoz]

Hi, I have some spare 15x 18650 batteries that I want use, but i am not sure about the two yellow wires, where is it connected to the battery?

[@faadar]

Why did you not just splice a new harness in and use the original location?

[@florvasquezr]

I was asking me the same thing.

[@NicoloZanetti]

In the video he says that the cable is too short

[@kanisohana]

Does the app software still have the same daily cut maximum time?

[@CyberSQUID9000]

Did work ok afterwards?

[@johnnypolex]

Yes, it works even better than when it was new. It cuts for probably double the time between charges now.

[@NicoloZanetti]

@@johnnypolex The black box with the battery can be opened by throwing it into the ground (I'm not joking).
I has plastic clasps all around, so a strong shock IS the only way to open it.
However inside the black box there is also a circuit, I have no idea what the circuit does, but you no longer have it in your Sileno now.
Here you could theoretically replace the individual batteries, but.... THEY ARE SOLDERED.
They really want you to pay 400$ battery pack for a mower I bought for 350$.
"You will have nothing and be happy" kinda thing.

[@johnnypolex]

@@NicoloZanetti Haha, interesting. That’s good to know. We sold the house and left the still working mower with it. Maybe the board helps balance the Lipo cells?