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crwdns2944351:0crwdnd2944351:0Cell Re-balance of Ryobi One+ 18V Li-ion Battery (130501002)crwdnd2944351:0crwdne2944351:0

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crwdns2936045:0crwdne2936045:0 crwdns2933505:0crwdne2933505:0 Adam O'Camb

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Introduction
This guide applies to Ryobi One+18V Li-ion Battery ([http://www.drill-battery.com.au/buybatteries.php/ryobi_130501002_power+tool+battery.html|130501002]), but should also have more general application. This guide will show you how to disassemble the battery pack and check the cell balance and rebalance the cells if necessary.
The battery should normally measure about 18V across the terminals (21V max). If it reads about 12V, then it is likely the battery protection circuit has activated because of cell imbalance. (Those were my symptoms.)
Cell re-balance could also help if the battery isn't taking a full charge (not showing green on the fuel guage button).
The time estimate for this guide is for disassembly and cell balance measurement. Cell rebalance charge time is extra.
CAUTION: Battery disassembly exposes high current circuits. Be careful!
This battery is of 2P5S configuration (sets of 2 parallel cells, 5 sets in a series string). It uses Sanyo 18650 Li-ion cells.