1999-2002 TRX400EX Fourtrax Service Manual, Page 221Get this manual
BATTERYICHARGING SYSTEM Battery charging This model comes with maintenance free (MF) batteryRememberthe following about MF batteries- Use only the electrolyte that comes with the battery- Use all of the electrolyte- Seal the battery properly- Never open the seals againCAUTION: For battery charging, do not exceed the charging current and time specified on the batteryUsing excessive current or extending the charging time may damage the batteryBATIERY TESTING Refer to the instructions inthe Operation Manual for the recommended battery tester for details about battery testing The recommended battery tester puts "load" on the battery so that the actual battery condition can be measuredRecommended battery tester BM-210-AH, BM-210, or BATTERY MATE or equivalent