3.6 v 800ma Ni-mAh cordless phone battery:

3.6V 800mAh Ni-MH cordless phone battery combines the advantages of rechargeability, environmental friendliness, and versatility, making it a popular choice for powering a variety of portable electronic devices, particularly cordless phones, where reliability and long-lasting performance are essential.

Deep cycle Gel 12v 45a lead acid battery