My solar string lights needed new batteries after which I initially purchased the more common NiCD. They were supposed to be an improvement over the NiMH that shipped with the solar lights thanks to a better range of operating temperatures — or so some of the sellers claimed in the Q&As. However, that was not to be the case and they performed very poorly (solar lights were dimming in a matter of two or three hours vs. 6-8). My plan was just to go back to the NiMH batteries, at which point I came across this charger and decided to give it a try.This EBL 808 (non USB model) was very affordable compared to the other options for charging both NiCD and NiMH batteries. It seems to operate quickly and run cool. (I was concerned it might get hot to the touch, a factor that has put me off of some types of rechargeables in the past.)At this stage it's too early to rate the longevity of the product but I do have a product improvement I would suggest to the manufacturer, which is also relevant to prospective buyers. The LED lights for each charging bay are Green (illuminated) when the unit is plugged in but empty. If upon inserting a battery and charging is needed, the LED changes to amber. Once the charge is complete, the LED returns to green. The upshot is that both an empty bay and a completely charged battery will read the same way. Why is this a design flaw? Because it is too easy not to fully seat the batteries, in which case they will read as if they are fully charged simply by virtue of the fact that they are not fully seated. Each battery bay, in turn, can accept AA and AAA. It is the AAA that seem to b easiest to improperly seat — they require more force to snap them into position. I made two passes after loading AAA batteries and both times they seemed to snap into place. Had I assumed they were fully seated the first pass, they may not have charged (or read like they needed a charge). All the while the Green LED was illuminated to suggest that my batteries were already fully charged. (In fact, not all of them were.)The solution is simple: The unit should not have an illuminated green LED if there is nothing sitting in the charger. That way, if you put a battery in to charge and it's Amber or Green, at least you know they're making proper contact. With the current design, I can foresee that I might be inclined to think my AAA batteries are bad performers when the reality might be that they weren't recharged because they weren't fully seated — even as the indicator read to the contrary. The manufacturer should either design it so that there is nothing illuminated when the battery bays are empty — or make it a three-way LED color change in which case a blue light could be used to indicate that the battery bay is empty. That color, in turn, could also serve to signal that a battery inserted has not actually made contact. (If the charger goes bad at some point and some or all of the charging bay LEDs remain blue with or without a battery in place, it would also signal that a problem has developed with the charger itself as opposed to the battery.)I'm not an engineer, just a consumer with a knack for sizing up the pros/cons about just about anything. For what it's worth, I hope this helps the manufacturer design an improved product.
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