Optimate 1 Global, TM-401, 4-Step 12V 0.6A Battery Charger-maintainer

I bought this less expensive charger as a second unit for my motorcycles and found it to work as well as the more expensive Optimate 4 Dual program charger.

Another winner in my Optimate stable. I own three different models now serving different purposes.I wanted one to keep my Optima Blue-Top agm in top shape. While agm's have very low self-discharge, mine is stored in the garage where temps in the summer usually hit over 100F. I got tired of babysitting it with a top-up charge every month or so, and the Optimate 421 is ideal for the job.I've got other maintainer chargers, but none of them do it the right way. What I really like is the 50% duty cycle during maintain - that is 30 minutes of maintenance, and 30 minutes of rest, along with the other testing features. This helps to ensure that the battery is treated correctly, rather than just dumping an endless supply of current (even if it low current) forever like other chargers do. This is important in my hot garage and gives the batteries a breather every 30 minutes. Common sense.While I could use this to charge the Optima Blue Top, I actually use another one better suited for the job - the Optimate 6 - to do the majority of the charge. The Optimate 2 is then used primarily for maintenance afterwards, freeing up the '6 to do other charging chores.For lithium, I prefer the 5A dedicated Optimate lithium charger. Now that they have a newer lower-amperage model for lithium, the "TM-471" model, that is what I would use instead for the additional lifepo4-only features.

Put one on all the rv’s. Easy to permanently install the pigtails and just unplug and go. Hook back up when done is just as easy. Great product and quit worrying about dead batteries.

This is my second one for a second bike good and reliable

Works As advertised, simple plug and play.

Just good to have around. Works well for the batteries I've used it on. Had it about 4 years now and it works.

Cold weather almost killed the batteries on both my motorcycles. Lithium battery on one of them recharged in about 3 hours. The acid core battery took almost 2 days to fully recharge. I'm tempted to get a second one of these chargers so I'll have one to maintain each motorcycle battery.

for garage type chargers, tecmate and ctek are all you should be spending money on. i've had several others kill batteries, and these were able to save those. now i keep these plugged in 24/7 and haven't had any issue with any battery.