Looking for a Lithium Battery but without the normal associated cost, then this lithium battery from TN should do the job

Key Features

• Using the technology of lithium iron phosphate cell, superior safety, thousands of cycles, 100% DOD, under normal conditions
• Built-in automatic protection for over-charge, over discharge, over current and over temperature
• Free of maintenance
• Internal cell balancing
• Lighter weight: About 40%-50% of the weight of a comparable lead acid battery.
• Can be charged using most standard lead-acid charges (set)
• Wider temperature range: -20-60
• Support for Series application expansion (up to 51.2V) and two in parallel

Specification