700mAh AHB413645PCT Battery Replacement Compatible with Sennheiser PXC 550 PXC550 Noise Cancelling Wireless Bluetooth Headphones

Perfect

I bought these to try and revive my senhouser headphones. Did not work.

Reviews were not the greatest but this was the only replacement battery we could find. Unfortunately charge barely lasts only about 1 1/2 hrs.

I too have had problems with the Sennheisers after replacing this battery, they won't charge beyond one or two dots. The usable time on the headphones seems to be good, but the headphones make the 'low charge' beep sound every 10 minutes the entire time. Very annoying.I suspect it's not really a problem with the battery, but that the headphones have stored some kind of battery charging profile that's incorrect. Perhaps there's a way to reset this if anyone can find the service manual.

Installed one of these batteries, and everything worked fine at first. When the original charge eventually ran down, I connected my charger with the original Sennheiser charging cable, but after several hours on the charger the battery did not recharge at all. Contacted the vendor and received a second battery. Same experience. Will be returning and requesting a refund.

Battery install was fine (using the official Sennheiser PXC550 service instructions), but I was only getting 4~5hr battery life after replacement. Then less. Now I can’t use my headset if it’s not plugged into USB (I get like 5 minutes before headset dies). I may actually re-install my 3 year old OEM battery.

I purchased a second one of these on the assumption that the first one I purchased was somehow an outlier in terms of life and charge capacity. Waste of Money and Time. Don't Buy.

Was able to have maybe two full charges done, now it doesn’t want to charge anymore. Will be sending this back. Tried to use this for in Sennheiser headset.