![Kastar 5-Pack Ni-MH 4.8V 1000mAh Two-Way Radio Battery Replacement for RadioShack 21-1914, RadioShack 21-1915, RadioShack 21-1917, RadioShack 21-1935, RadioShack 21-1936, Uniden BP38, BP39, BP40 - Walmart.com Kastar 5-Pack Ni-MH 4.8V 1000mAh Two-Way Radio Battery Replacement for RadioShack 21-1914, RadioShack 21-1915, RadioShack 21-1917, RadioShack 21-1935, RadioShack 21-1936, Uniden BP38, BP39, BP40 - Walmart.com](https://i5.walmartimages.com/asr/3162b805-374c-4c66-a303-454439d13b92.b5b1873f106ecdd0c3c5b92f285c3212.jpeg)
Kastar 5-Pack Ni-MH 4.8V 1000mAh Two-Way Radio Battery Replacement for RadioShack 21-1914, RadioShack 21-1915, RadioShack 21-1917, RadioShack 21-1935, RadioShack 21-1936, Uniden BP38, BP39, BP40 - Walmart.com
![Amazon.com: Kastar 4-Pack Ni-MH 4.8V 1000mAh Two-Way Radio Battery Replacement for RadioShack 21-1914, RadioShack 21-1915, RadioShack 21-1917, RadioShack 21-1935, RadioShack 21-1936, Uniden BP38, BP39, BP40 : Electronics Amazon.com: Kastar 4-Pack Ni-MH 4.8V 1000mAh Two-Way Radio Battery Replacement for RadioShack 21-1914, RadioShack 21-1915, RadioShack 21-1917, RadioShack 21-1935, RadioShack 21-1936, Uniden BP38, BP39, BP40 : Electronics](https://m.media-amazon.com/images/I/71Pd-rZFXYL.jpg)
Amazon.com: Kastar 4-Pack Ni-MH 4.8V 1000mAh Two-Way Radio Battery Replacement for RadioShack 21-1914, RadioShack 21-1915, RadioShack 21-1917, RadioShack 21-1935, RadioShack 21-1936, Uniden BP38, BP39, BP40 : Electronics
![Guest post by Keith Thrower: Technical factors affecting CW radio communication in WW1, part 2 - Innovating in Combat Guest post by Keith Thrower: Technical factors affecting CW radio communication in WW1, part 2 - Innovating in Combat](http://blogs.mhs.ox.ac.uk/innovatingincombat/files/2014/06/Marconi-Short-distace-radio.jpg)