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Progress of technology and amortising costs over time I guess. Panasonic and Bosch makes best auto batteries, but can't buy them OTC due to import restrictions & tarriffs. Panasonic is main supplier of batteries to Tesla.
Those 100-month batteries were $38 from Costco when they 1st came out. Costco's gone in opposite direction to maximise profits. Switched vendor to lower-quality product (36-months), and charges 3x as much.
I build my own lithium batteries now:
- 4x 26650 LiFePO4 cells
- BMS circuit
- case
$40-50 total
There's guy on VFR forums that converted starter jumper-pack into lithium battery by changing cable ends. Those were going for ~60U$ last holiday season @ Costco. I worry about capacity as those use smaller 18650 cells. Should be fine for Ninja 250, might not be enough for VFR
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