Look no further than the UPG UB12900 (45826) 12V 100Ah Sealed LiFePO4 battery. So why wait?. Ultramax LI100-12DINBLU – DIN BASE 12V 100Ah LiFePO4 Battery 4000 Cycles With Bluetooth Energy Monitor. Ultramax 12v 100Ah LiFePo4 battery bluetooth function can monitor the following status from smart phone.
eBay