The typical ball bearing fan like the one in our battery packs is typically rated for 60,000-100,000 hours. That's 7-10 years of running 24-7 at full power. Fan life is not an issue.
Ron,
Contact me if you want to discuss a custom charger, the concept of using multiple supplies can be expanded to provide just about any combination of constant current and high rate charging.
This new design is to produce a low priced charger that can charge a depleted pack to full overnight, without any danger of overcharging.
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