502540 battery for Sena SMH 5 Motorcycles Bluetooth Headset

I purchased this battery to replace the battery in my Sena 20S BT headset, which I have been using at least weekly since 2017. Last week while riding, I noticed that it was not holding a charge for more than a few hours, even though it had been charging overnight. I took it apart and discovered that the battery was “swollen” and needed to be replaced. I ordered this battery on Amazon after verifying the model number, etc. The battery dimensions and connector are identical to the SENA OEM one. It fit perfectly into the tray and the battery itself appears to be of similar quality as the OEM unit, at least from a visual inspection. I have not personally confirmed its advertised amperage. I plugged it in to verify that it was charging normally for about 20 minutes, before reassembling the headset. I found no indication of delamination, swelling, or felt any heat buildup whatsoever on the battery surface. So far, so good.If anything changes after a few weeks of use, I will update this review. Good luck.

I can not speak to the battery life just yet, however installation was a breeze#1. I Removed the 3 size 7 Torx screws from the Sena SMH5 unit. "Please Note remove the screws over a bowl in the event you drop one like I did lol"#2. Pull the other battery out carefully from the connection on the board and be mindful of the double sided tape on the battery it is sitting flush to the circuit board.#3. Check the polarity of the wires on the old battery and the new one to make sure that they match#4. Install the new battery if the wires match up back onto the circuit board.#5. I used some 3M double sided tape on the battery back to the housing not the circuit board when I placed it back together.#6. Lastly install the 3 size 7 Torx screws back in there place and then power on your Sena Smh5 unit to see if the lighting comes on as it should.Three other things you may want to take note of#1. If you drop the rubber charging cover " like I did " it does slip back into it's place#2. Make sure you do not over charge your new battery like I did my old one, as I had to do all of this because I overcharged the factory battery lol#3. Small hands and fingers will be helpful my large hands and large digits made it trying placing the battery back onto the board, not to proud to say I called my wife over to help with that part lolBest of luck and hope that this helps someone else

A bit of online searching told me this was the size, voltage, and capacity of battery I needed to replace the old stock battery in my Sena SMH5-FM headset.However, I was hesitant to buy this battery since there were no reviews. It caught my eye because it was less expensive than several other similar batteries that had fairly good reviews. Ultimately, I figured these batteries probably all come from similar factories in China, so I decided to give this one a shot.The battery was delivered in two days and was packaged well. On arrival, the voltage measured 3.94 volts which is normal for a partially charged 3.7 V lithium battery.I disassembled my SMH5 and was happy to see that the batteries were nearly identical in size. I was also happy that the polarity of wires to the plug was the same for both batteries. You will see in the description of this battery and in reviews for other similar batteries that occasionally the polarity of the wires is switched. If you get a battery like that, it's not a big deal. You can switch the wires yourself in a few minutes, but it was nice not having to do that.I secured the battery in my SMH5 using a small piece of double-sided tape and reassembled the SMH5. The entire process took me less than 10 minutes. I gave it a quick test run to make sure it was working, then plugged it in to fully charge.Once it's fully charged, I will take it through a few charge cycles to see how it holds up. If there are any problems, I will update my review. But based on my experience so far, I give it five stars.If you are buying this battery for a Sena SMH5 or SMH5-FM, you will need a size T7 torx (star) screwdriver to open the headset and a small piece of double-sided tape to secure the battery in the headset. There's a good write-up online if you need it.

Disappointed, after replacing the battery, already a pain since you need to unglue the multi pin connector , now the sena , wont last more than half day , i dont recommend this battery, original it will last from 9 am to maybe 4 pm , always on off course, and taking once a while with my group , no music , now , i turn it on at 10 am and at 1 pm was already low battery indicator , totally disappointed, now looking for a real OEM battery, not greta either but better then this one .😥

I was looking for a 3.7v Lithium Ion Battery with the smaller connector and this one worked perfectly. The size is perfect. So far it is working well. I'm not sure of the longevity yet, but based on the performance so far, I would recommend it.

I was a little hesitant, not buying OEM, but it was in stock and the reviews were good, for the 950 mAh model, so I ordered it. Install was easy, peasy, had it installed in about 3 minutes and charged it right up. Worked perfectly and lasts longer than the battery that was in my Sena 20 from new.I'm very pleased with the battery, I was a little hesitant buying the larger size, but I first purchased the smaller capacity one that was supposed to be for my unit and it was dying after about 4 hours or riding. Sent it back after the first ride and ordered this one, fit and worked perfectly and it lasts all day riding and then some.Great choice, easy to install (have to break a little plastic piece off inside the head set to install it or any of them, but that was easy), works perfectly!Will buy again, when this one goes down, probably in 3 years...

This battery was a massive upgrade from the previous battery. I travel on my motorcycle and I can listen to music and take calls all day. Recharges in the same amount of time also.