MaximalPower9V Rechargeable Li-ion Battery 650mAh w/USB Type-C Charging Cord | for Smoke Detectors, Digital Alarm, Guitar Pedals, Radios, etc. (1x 9V Battery 650mAh & Charging Cable)

Bought this for my smoke detector less than a 3weeks ago, charged it fully before installing in detector thinking cool wont have to worry about anything for awhile and few days go by and 3am i hear a chirp chirp eminatting from my smoke detector due to low battery, how can this be a regular battery lasts months and months and this lasts about 2wks in smoke detector that draws very little off it, so i charged it again thinking it was something I did mabey didnt charge it right even though its kinda idiot proof red when its charging green when its charged simple, and it lasted about a week and a half im guessing because this time at 2am when smoke alarm starts piercing my skull through a deep sleep id fallen into my cherub like demeanor was not to be found instead Im some nut job beating the stupid smoke alarm off the wall with my boot so ut will just stfu and let me sleep now i have some minor repairs to make and have to buy a new smoke alarm

Good value.

When you buy a 9 volt rechargeable battery make sure of what amps is the battery rated. That's why not all rechargeable batteries created equal. LOL. I use mine on a metal detector which only takes a 9 volt square and I needed to last and this one does the job

The media could not be loaded.  My project worked well with this battery. I liked that it is rechargeable using any usb charger. It supplies sufficient power for the arduino and 4 motors. The seller answers inquiries very quickly. Thank you.