Best Tenergy TN141 2 Bay 9V Smart Charger with 4 pcs 9V 250mah NiMH Rechargeable Batteries and Read Consumer Reviews
Charger Features * Rapid charging * Worldwide voltage 100V ~ 240VAC * Automatically detect-Delta V * Microprocessor controlled to ensure charger safety * LED indicator for each individual bay Features * Applicable for 9V rechargeable Ni-MH batteries * Worldwide voltage 100V ~ 240VAC * Built-in micro-controller to ensure full charge * 5hr safety timer * Circuit / polarity protection * Automatically detect - delta V * LED indicator for each individual bay * Indicator status: Charging: RED, Fully charged: GREEN Battery Type Capacity Charging time 1~2pcs Ni-MH 9V 160mAh 1.8 hrs 180mAh 2.0 hrs 200mAh 2.2 hrs 220mAh 2.5 hrs Specifications * Outlet input voltage: 11.4V * Charge current: 100mA x2 * Operating Temp: 0 ~ 40?C * Weight: 83g Download product manual here. Tenergy 9V 250mAh Features and Benefits * High quality 9V rectangular size rechargeable Nickel Metal Hydride (NiMH) battery Ultra high capacity of 250mAh * Exact replacement for standard 9V rectangular size battery * Provides very long use time per charge with this high 250 mAh capacity * Advanced Ni-MH technology means much longer use life per charge than other rechargeables * Designed for enhanced performance for high drain applications such as: R/C controller, detector, transmitter, and other portable high drain digital electronics * Can be recharged for up to 1000 times, providing big savings by replacing hundreds of expensive throw away 9V rectangular size batteries. * Convenient operation without memory effect. * Can be rapidly charged with our chargers model TN141, TN136, TN137, T9688, BC1HU, V1199B, T2299 V3969A1, T228. * Dimensions: (H x L x W): 48mm x 26mm x 16mm. * Weight: 1.6oz per cell * 6 months warranty. * Battery tested based on International Electronic Commission (IEC) standard to ensure capacity, quality and life time
This review is from: Tenergy TN141 2 Bay 9V Smart Charger with 4 pcs 9V 250mah NiMH Rechargeable Batteries
This charger is actually constant-current, in the literal sense - it always charges at ~200mA. That said, it charges by "pulsing" - turning full bulk charge on/off depending on battery charge level. When empty, the charge pulses are nearly continuous, when full - just once every 8 seconds.
This approach seems well-suited for NiMh batteries as it allows them to cool down between pulses, preventing venting/overheating, and also makes for a compromise between a trickle overcharge and self-discharge after charging is complete. I've had cheap 20mA trickle chargers "pop" 9V NiMh batteries (cells physically swelled and popped the casing), and I don't think that will happen here. That said, it does tell you to remove batteries after they are full, but so does every other charger.
It makes a bit of a hissing noise (in between pulses) but it's not too bad unless you plan to keep it right next to you.
Also, the current price here is cheaper than ebay (wish I looked before I bought)
Price: $24.99
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