Here are Li-Ion batteries and prices from the company in that article:
12v 200ah lithium ion battery
12V 200AH LITHIUM ION BATTERY
Model/SKU: SB200
Weight: 72.00 lbs
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$2,299.99
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Smart Battery™ SB200
12V 200AH Lithium Ion Battery
Size: 8D
Nominal Voltage: 12.8V
Amp Hours: 200
2000 Cranking Amps
Length (inches): 20.47"
Width (inches): 10.5"
Height (inches): 9.0"
Weight: 72 lbs.
240 min @ 50A
60 min @ 200A
Max Continuous Discharge 120A
Charge Voltage: 14.6v
Life in Cycles: 3000-5000
Operating Temperatures - 4 F + 158 F
99.1% Efficient
Internal Impenetrableness: 0.9>>
-LiFePo4 technology
- 70% Lighter
- 10 x Longer life
- ZERO Maintenence
-Heavy duty high output terminal posts.
-Dual purpose; Engine Starting and Deep Cycle
-
Automatic built in battery protection system.
Perfect for:
MOTORHOMES, TRAVEL TRAILERS, FIFTH WHEELS,
BOATS, YACHTS, SAILING, TROLLING, ELECTRONICS
SOLAR BACK UP POWER AND OTHER DEEP CYCLE APPLICATIONS