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Charging LiFePO4 Batteries in Series

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jpanhalt

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Microchip makes this chip (**broken link removed**) that includes a claim for charging a 2S pack. FMA makes a charger that is sold on eBay for the same claimed purpose (**broken link removed**). There are also bare bones boards for series charging on eBay. Except for the Microchip product, the other products need to "balance" the cells by attaching a lead to the common between the two cells.

Does anyone have experience charging two-cell packs in series without using additional connections to the pack for balancing? In particular, has anyone used the MCP73223 chip? The Microchip evaluation board is about $25 for two units. BTW, my interest is in charging two, RCR123A's in series.

John
 
Mi
Microchip makes this chip (**broken link removed**) that includes a claim for charging a 2S pack. FMA makes a charger that is sold on eBay for the same claimed purpose (**broken link removed**). There are also bare bones boards for series charging on eBay. Except for the Microchip product, the other products need to "balance" the cells by attaching a lead to the common between the two cells.

Does anyone have experience charging two-cell packs in series without using additional connections to the pack for balancing? In particular, has anyone used the MCP73223 chip? The Microchip evaluation board is about $25 for two units. BTW, my interest is in charging two, RCR123A's in series.

John
Series charging if not load balanced demands good matching (<1%) of SoC and ESR to prevent aging from overcharge.
 
6 cell lead acid batteries are matched <1% due to fabrication process.

6 cell Lipo modules are also matched at factory.
 
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