GS YUASA Auxiliary battery HJ-S34B20L-A Used for less than one year. The battery was recently over-discharged once, but it has since been recovered and is working normally. After being fully charged and left to rest for over 24 hours, it measures 12.9V. I originally thought it was beyond repair, so I purchased a replacement. As a result, this battery is now surplus to requirements. Collection: B93 Postage: Available at buyer's expense.