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7) Properly commissioned "MF" batteries retain their charge during storage better than
conventional batteries. This is especially the case with most of the recent new “WET” MF
batteries. However, if left for excessive time without being re-charged, they tend to go into
deep-discharge from which they are often very difficult to recover unless subjected to
relatively high voltages. This level of applied voltage is only achievable by chargers such
as BatteryMate which use the principle of "constant current". This means that the voltage
is controlled and varied according to the reluctance or otherwise of the battery to accept a
charge, so in "difficult" cases, the charger simply increases, (up to a specific & safe limit)
the applied voltage until the reluctance of the battery is eventually overcome and the
charge can be made to enter the battery, thus recovering it.
8) The “MF” push-button selector beside the symbol of the black battery inscribed "MF",
increases the voltage level at which the constant current charging stage is terminated from
14,5 V for most other batteries to 16,9 V for dry-charged MF batteries, see table below.
9) Push the “MF” button after pushing the charge button only when charging dry-charged MF
motorcycle batteries (those delivered with separate special acid packs, typically type-
labelled "YTX-", "YTL-", “YTH-” for Yuasa, or with the Y substituted by “C” or “G” for
example, for some other manufacturers. For WET “MF ” batteries & all other batteries, or if
in doubt, do NOT push the MF button.
When & when NOT to push BatteryMate’s ‘MF’ button when charging :-
!! If you are not sure, do
not
push the MF button !!
Battery Type
Push ‘MF’ button?
YTR-4-series
YES
YTH-series
YES
YTX-series (except for YTX20-BS)
YES
YIZ30 & YIZ50 (Yuasa Inc USA)
Not tested yet = NO provisionally
YTX20-BS (after-market, DRY)
NO
YTZ-series (new Yuasa-Honda WET)
NO
FTZ -series (new Furukawa -Honda WET)
NO
Harley- YTX20-BS (1998/99 models, WET)
NO
Harley #65989-97A (Y2K models, WET)
NO
Harley #65991-90B (Y2K models, WET)
NO
Harley #66010-97A (Y2K models, WET)
NO
Hawker Genesis G13EP/G16ET/G26EP (WET)
NO
YT7B-4 (Yuasa, WET)
NO
GT12B-4 & GT14B-4 (GS Battery Co-Yamaha WET)
NO
CHARGER OPERATION
1) Before starting, it is important to establish whether or not the battery you are about to
charge is an "MF" battery of the type described above, or another type of 12 V lead-acid
battery. Do not attempt to charge any battery other than a 12 V lead-acid battery. Refer
to the previous section. If in doubt, do NOT push the MF button.
2) Make sure the range selector setting (knob with the red cap on the left of the control
panel) is correct for the battery to be charged, according to the selection table. Sealed
deep cycle or trolling type batteries, often called "SLA", require a lower charge current
than those indicated on the range selection table for the relevant Amp-hour battery
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