Charges fast and I love that it tells me as each individual battery is fully charged so it can be removed. Also the only spots ...  Read More

Charges fast and I love that it tells me as each individual battery is fully charged so it can be removed. Also the only spots that turn on are the ones that you have placed a battery in which is a good energy saver  Read Less

Summary:This review is targeted at the  SunLabz Smart Rechargeable Battery Charger - 16 Bay/Slot  its...  Read More

Summary:This review is targeted at the  SunLabz Smart Rechargeable Battery Charger - 16 Bay/Slot  itself.• It includes using a  Opus BT-C2000 4Bay/Slot  to jump start dead batteries among other uses during this time.• This was a great opportunity to check out both chargers features and abilities at the same time, because I literally just bought both of them, at the same time having no experience with either until last night.• All batteries used are NiMH.Experiment:Completely discharge then recharge a huge grab bag of mix and match batteries, with wildly different mAH ratings, AA + AAA sizes and manufacturers. It worked great, with caveats I expected after reading tons of reviews.Most of these batteries are at-least 3 to 5 years old, some much older. None of the batteries had ever been discharged or conditioned in any way. They'd simply been recharged, including using a FAST charger, over and over for years.During the years their cycle-life before depleted got to a point where some lasted a couple minutes while others a few seconds. Some wouldn't hold a charge at all. Everything just described was expected, especially due to their age plus the use of FAST chargers.So, every battery was in various but really terrible conditions. With the total number of now-usable rechargeable batteries I wound up with in the end, which was ALL of them, this pretty much paid for both chargers the first go. I consider this an awesome result.The sequence I used to successfully charge every battery, fully reconditioned to a point far, FAR superior to their state before buying the chargers is listed below. This includes bringing back several totally dead un-chargeable batteries using the  Opus BT-C2000 4Bay/Slot  to jump start them.1. Filled 16 bays looking for empty cell icons or missing cell icons.1.1. IIRC the ones the SunLabz couldn’t do anything with showed empty cell channel icon with no activity. Missing channel icons were because the battery wasn’t inserted fully for a solid long term connection.1.2. For AA size, put negative side in first then snap the positive in. If you don’t hear a good snap it’s not seated as well as it needs to be for the unit to recognize the battery for the entire process in that channel.1.3. Unfortunately I forgot to get shots of these steps. I was too focused on seeing if this thing would work on such a massive variety of ancient batteries in horrible condition.2. Extracted 5 or 6 dead ones it couldn’t do anything with, yet…3. Put those in the  Opus BT-C2000 4Bay/Slot , Charge mode, Current at 600ma to jolt them awake.3.1. I let them charge until mAH reading was 30+ on each then extracted them.3.2. Due to the C2000 being an incredible unit with selectable current it didn’t take long at all to get from 0 to 30+ mAH. I could have used 800ma or 1000ma but there wasn’t a need.4. Put them back in the SunLabz with it unplugged, plugged it in. I gave it 30 seconds (defaults to charge) to make sure it saw all batteries. It did.5. Changed mode to Discharge and let it alone for several hours.6. After they were all discharged I either left it because it had automatically changed to recharge, or pushed the button changing to Charge mode. I can’t recall which it was.7. I left it alone to Charge the lot. I took a few pictures near the end of this period.8. When it finished, the LEDs were dark and all channels showed all batteries charged.8.1. The SunLabz LEDs stays lit the entire time it’s doing something. At the point of every channel being completed the LEDs turn off their backlight.8.2. Took picture.The pictures show:• All but 3 completed charging.• All but 2 completed charging.• All completed with LEDs dark.•  Opus BT-C2000 4Bay/Slot  showing 3 of 4 fully charged with 1 still going, and how much mA it’s applying to that channel at the time.o The C2000 has awesome features. One just described is the ability to show how much Current is being applied per channel. This value decreases as the battery nears its fully charged state, until it reaches trickle state pumping just a few mA keeping it ready to rock.o Since I have more than 16 batteries I used the C2000 for the excess batteries after the bulk were filling the SunLabz.Overall impressions:These chargers are outstanding for their intended purpose and work together beautifully in situations where it’s needed. In my case being able to bring back some dead batteries allowing the SunLabz to see and work them was a major goal and was totally successful.Heat:Not surprising, some of the batteries became quite hot to touch after several hours as they recharged in the SunLabz. I simply put the unit on the floor, pointed a floor blower down at the surface and all batteries became cool to touch, continuing their recharge without issue until completed.• I believe the differences in heat level related to newer batteries not becoming as hot as more ancient batteries. Other factors may be part, or all of the reason I’m not certain.• Regardless, expect batteries, especially ancient and abused ones to become pretty hot. Pointing a fan at the unit isn’t a big deal to me at all. I’ll be curious to see down the road if this still happens. I’m expecting it won’t (not to this degree) because of their reconditioned state.Conclusion:This SunLabz unit works extremely well but lacks custom Current selection. If they added that this unit would probably become THE defacto 16 bay charger for most people. It would allow it to zap back dead batteries to the point it could then be set to a lower Current and charge even ancient dead batteries without needing a 2nd method to wake those up first.I definitely recommend the unit as of now. Over time if this unit fails in some way I’ll update this review to reflect it.Final thoughts:I examined SO many large bay count chargers available at Amazon. I settled on this unit because the aggregate data in reviews about it surpassed the others. Things included dealing with batteries other units couldn’t no matter what they tried, max bay count, “good enough” LEDs to know what it’s doing, several reviews indicated it –does- trickle charge even though I didn’t see this in description. So it’s still TBD if this SunLabz really does trickle or not.  Read Less

This is a nice rechargeable battery unit. I like that it has 16 slots that allows me to charge my batteries. Each unit tells yo...  Read More

This is a nice rechargeable battery unit. I like that it has 16 slots that allows me to charge my batteries. Each unit tells you how far your battery is charged. I like that feature for the fact that you can put batteries in at any different time and not take them out to early and used a half charge battery. I also like the feature of being able to use any different type of rechargeable battery and not just the sun labz brand. I like knowing that I have a good quality charger and can recharge and use my batteries instead of constantly having to buy new.  Read Less