Bulk charge stage: Charges at 0.8 Amps constant current until such time as the battery is normally able to crank the engine. It also comes with an alligator clip harness if needed and the Optimate 4 unit itself has about 8 feet of electric cord, along with screw holes for wall mounting (but no screws).

CAN-bus program: the KEYLESS activation program guarantees automatic re-opening of the connection even with the ignition turned off. 12. The alternating test and charge maintenance program is designed to provide the recommend maintenance voltage for AGM / GEL batteries whilst reducing the average voltage as required by STD filler cap batteries, making it ideal for indefinite and 100% safe long term maintenance charging of any type of 12V lead-acid battery. Technical Specifications Two (2) desulfated wet cell lead acid 10 ah & 14 ah batteries were hooked up in an attempt to desulfated these batteries and revive them. Desulphation and recovery: STANDARD (up to 16V) engages automatically to recover neglected, flat batteries from a sulphated to a chargeable state. For badly neglected batteries the TURBO stage (max 22V) engages if vehicle electronics are not detected or the battery is out of the vehicle. The turbo stage is disabled in CAN-bus mode. The safe low voltage PULSE recovery engages for the final 15 minutes.

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And while a two year warranty sounds good, this warranty is only good if the unit only fails to operate as designed and that, my friend, is the snag.

STYLE: Weatherproof case with wall mounts, with 6ft / 180cm AC supply lead and 6ft / 180cm charge lead ending in SAE connector.Desulphation and recovery stage: Tests the battery for possible deep discharge or sulphation. If necessary, OptiMate 3 automatically engages a special high voltage recovery mode (up to 20V) with a very low fixed current to desulphate the battery.

OptiMate 4 is totally safe for months-long connection and maintenance of irregularly or seasonally used batteries even while still connected to the vehicle. The sophisticated charging algorithm ensures no risk of over-charging. Suitable for all types of rechargeable 12V lead-acid batteries, filler cap types, absorbed glass mat (AGM or MF), valve regulated (VRLA) and GEL-electrolyte. Just connect OptiMate 4 to your battery, the rest is automatic, electronically protected against user errors, there is no switch, no fuse and there are no sparks. Multi stage charging – bulk, pulse absorption, cell balancing ensures each cell in the battery performs at maximum.Maintenance / float charge stage:Irrespective of the voltage retention test result, a maximum voltage of 13.6V is applied with up to 200mA available to support connected electronic alarms or other small loads. The Optimate 4 works, it has a lot of lights, a two year warranty, and many different types of accessory harnesses. It’s been “Recommended by 8 major powersport manufacturers”, according to Tecmate. Multi stage desulphation– low voltage, ‘Turbo’ and pulse will recover sealed batteries, including cyclic cell and pure lead AGM.

And I had to keep the manual near the charger so I could keep referring to it to interpret what was happening to the battery. The Optimate 4 has several microprocessor controlled stages that analyze, desulfate and charge motorcycle and automobile batteries. Dead batteries that is. Even some sulfated ones, according to its maker, which boasts the Optimate 4“saves batteries other chargers can’t,” by way of a 6-step charge program, and that it’s “recommended by eight major powersports manufacturers.” And those are about the most respected batteries in the motorcycle industry. Yuasa employs full-time scientists and engineers who fully understand battery chemistry and design, as well as battery charging.Delivered with eight interchangeable connection sets, four with clamps for bench charging, and four with in-line protection fuse and eyelet terminals for permanent attachment to in-vehicle battery to allow easy reconnection of charger when necessary.