From Cambridge University Caving Club - CUCC wiki
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More-idiot-proof drill-battery charging, and upgrading poorly drill packs | More-idiot-proof drill-battery charging, and upgrading poorly drill packs | ||
| − | Wookey has built proof-of-concept idiot-proof 1hr charger out of makita charger case and [https://hobbyking.com/en_us/turnigy-b4-compact-35w-4a-automatic-balance-charger-2-4s-lipoly.html?___store=en_gb|turnigy B4 35W autocharger ] They are £9 | + | Wookey has built proof-of-concept idiot-proof 1hr charger out of makita charger case and [https://hobbyking.com/en_us/turnigy-b4-compact-35w-4a-automatic-balance-charger-2-4s-lipoly.html?___store=en_gb|turnigy B4 35W autocharger ] They are £9 each. Donor charger bodies off ebay are about £10-13. |
| − | B6 50W charger (£11) would charge faster, but | + | B6 50W charger (£11) would charge faster, but is discontinued. |
== Tasks == | == Tasks == | ||
* Test drill batts from 2017. Done (3 need new cells) | * Test drill batts from 2017. Done (3 need new cells) | ||
| − | * Build 2 or 3 balancing autochargers. Cannot source female batt connector, so must buy dead makita chargers (about £10 each). | + | * Build 2 or 3 balancing autochargers. Cannot source female batt connector, so must buy dead makita chargers (about £10 each). 2 more base bodies bought (May 10th) so we have 3 now. |
* Replace PCBs in 7 ('non-makita-charger') packs with own balance-connector board (about 3 hours per batt!): 2 done (April 15) | * Replace PCBs in 7 ('non-makita-charger') packs with own balance-connector board (about 3 hours per batt!): 2 done (April 15) | ||
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* Have bought/acquired parts for battery-tab spot welder (1kW transformer, controller, electrodes). Needs assembling. | * Have bought/acquired parts for battery-tab spot welder (1kW transformer, controller, electrodes). Needs assembling. | ||
| − | * | + | * The 2 new packs will need balance-connector board. |
== Batts == | == Batts == | ||
| + | Possible 18650 choices: | ||
Samsung 25R 2500mAh 20A | Samsung 25R 2500mAh 20A | ||
Samsung 30A 3000mAh 15-30A | Samsung 30A 3000mAh 15-30A | ||
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| − | + | Last update 2018.05.15 | |
| − | Last update 2018 | ||
Revision as of 12:55, 15 May 2018
More-idiot-proof drill-battery charging, and upgrading poorly drill packs
Wookey has built proof-of-concept idiot-proof 1hr charger out of makita charger case and B4 35W autocharger They are £9 each. Donor charger bodies off ebay are about £10-13.
B6 50W charger (£11) would charge faster, but is discontinued.
Tasks
- Test drill batts from 2017. Done (3 need new cells)
- Build 2 or 3 balancing autochargers. Cannot source female batt connector, so must buy dead makita chargers (about £10 each). 2 more base bodies bought (May 10th) so we have 3 now.
- Replace PCBs in 7 ('non-makita-charger') packs with own balance-connector board (about 3 hours per batt!): 2 done (April 15)
- Rebuild 3 new packs. Needs proper tab-welder (Tried soldering last year, and DIY tab-welding - not reliable enough). Batt drilling current tested at 26A, so 15A cells needed. UK supplier is https://18650.uk/ Can now get 2 and 2.5Ah 15A cells, so should be able to build 4 or 5Ah capacity packs for ~£40. Nickel tab-strip bought.
- Have bought/acquired parts for battery-tab spot welder (1kW transformer, controller, electrodes). Needs assembling.
- The 2 new packs will need balance-connector board.
Batts
Possible 18650 choices: Samsung 25R 2500mAh 20A Samsung 30A 3000mAh 15-30A LG HB2 1500mAh 30A £3.79 LG HB4 1500mAh 30A £4.19 LG HB6 1500mAh 30A LG HD2 2000mAh 25A LG HE4 2500mAh 20A LG HG2 3000mAh 20A £5.45 Sony VTC5A 2500mAh 25-35A £6.19 Sony VTC6 £5.45 3000mAh 15-30A £5.45
Last update 2018.05.15