Lithium Battery Smart 12,8V & 25,6V - Victron Energy
Amazon.com: funkawa 4 Pack- Shockli AA Size LiFePo4 650mAh Battery, AA 3.2V Solar Rechargeable Batteries - Ideal for Solar Garden Light : Health & Household
Coolook LFP 14500 battery 2-pack (AA sized Lithium rechargeable) – Out of Darts