7.4v 850ma rechargeable battery for autonomous gsm alarm with sos emergency call button intercom

7.4v 850ma rechargeable battery for autonomous gsm alarm with sos emergency call button intercom

Connection of the 2 batteries for GSMSOS There is no connector on the board because the battery must be connected by soldering. 1 cut the 2 connectors 2 connect the 2 3.7v batteries in series to obtain 7.4v 3 connect the 2 batteries in series by soldering to the GSMSOS printed circuit on the part circled in red. view the photo

https://eclats-antivols.fr/84800-thickbox_default/batterie-rechargeable-74v-850ma-pour-alarme-gsm-autonome-avec-bouton-appel-sos-urgence-interphone.jpg